#Original
Seisai Music School
[GL] Tomorrow, you too will be a star on stage
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Published at 2026-06-24 | Updated at 2026-07-07
STARLIGHT / 2026GIRLS OPERASEISAI.AC
星彩Music School
ORIGINAL
STARLIGHT
2026
STARLIGHT
2026
SEISAI — MUSIC SCHOOL INTRO ⊐
Can you reach the 'Starlight Seat'
on stage?
on stage?
✦
GIRLS ONLYSOSEI 60thEST. 1967
SEISAI
In Seisai City, nestled in the mountains of Hyogo Prefecture, where stars descend onto the lake at night, lies Japan's most liberal opera school. This school, open only to girls, allows freedom in dress and romance. However, there is one rule — those who ruin the stage will lose their roles without warning.
▸ YOU
A freshman of the 60th class in the Department of Stage Arts. You will perform eight stages over two years as an actress.
▸ GOAL
The lead role in the graduation performance, known as the 'Starlight Seat'. Only two people can sit there.
MAIN CASTSWIPE ➜
The Stars of Seisai — Swipe to meet them
Star Role / Sei Role
17 · METHOD
Takanashi Tsubame
An actress of the Method type, who immerses herself into roles as if disappearing. Her potential and explosive power are high, but she often loses her way back from the role.
#154cm#INFJ
Color Role / Cai Role
16 · GENIUS
Mikazuki Ginga
A former famous child actor. She finishes in one day what takes others ten, and sleeps for the remaining nine. The greatest genius of the 60th class, but her daily life is more miserable than anyone's.
#158cm#ESFP
Color Role / Cai Role
18 · THE SUN
Hanasaki Himawari
The eldest daughter of the prestigious 'Hanasaki' opera family. After failing to enter Higioka Opera School for four years, she enrolled in Seisai. She wants to be everyone's older sister.
#165cm#ENFP
Star Role / Sei Role
17 · TOP
Kazamatsuri Hayate
The top student of the 60th class in the Department of Stage Arts. An embodiment of reproducibility, capable of performing the same stage a hundred times. His strength, and weakness, lies in his theory armed like armor.
#178cm#INTP
Playwriting/Directing
16 · WRITER
Hanasaki Tsubaki
The top student and sole writer of the 4th class in Playwriting and Directing. The youngest daughter of a family of actors who couldn't perform on stage, so she wrote for it. A tyrant of the practice rooms with a tongue as sharp as a pen nib.
#168cm#ENTJ
🥀
??? · BLUE ROSE
？？？
An anonymous blue rose arrives at the dressing room on the night Hinamizawa ends. Who is the owner of that rose—
MUSIC SCHOOL星彩音楽学校
A place where free
stars shine.
stars shine.
✦ Iron Rule: Law of the Line
Behind the freedom of dress, makeup, and romance lies a harsh judgment. If you cross any of the following three lines even once, you will face immediate role revocation without warning, known as Rakusei (落星 - Falling Star).
① A fatal accident on stage
② Failure in self-management that harms the performance (condition collapse)
③ Fatal disrespect towards colleagues or the stage
※ However, this is not expulsion, and you may return the following season based on your skills.
① A fatal accident on stage
② Failure in self-management that harms the performance (condition collapse)
③ Fatal disrespect towards colleagues or the stage
※ However, this is not expulsion, and you may return the following season based on your skills.
Seisai Music School
A 2-year opera school. Its founder, Hoshino Sai, was a director who worked on Broadway after moving to the US post-war. Upon returning to Japan in 1967, she founded the school with the belief that 'talent, not tradition, creates stars.' The opera troupe was founded in 1972, and in the 1980s, after attracting large-scale investment from a global media group, a glass-fronted grand theater was built, propelling it to international fame. There is a school uniform, but almost no one wears it properly. Rumors occasionally circulate about students dating each other.
Higioka Opera School
The opera school with the longest tradition. Located in Seisai City's neighboring Higioka City. A rival. Tradition, bloodline, strict discipline. Every October, the second-year students clash in the Autumn Competition.
Department of Stage Arts
The star and flower of Seisai Music School, cultivating opera actors. This is the 60th class. During the first year's 'Hina-sei' (雛生 - seedling) period, students undergo cold, fundamental competition and wear silver ties. In the second year's 'Ka-sei' (華生 - blooming) period, they gain eligibility for grand theater performances, wear gold ties, and strive for the graduation lead role.
Department of Playwriting and Directing
A newly established 4-year department that nurtures future masters, not just simple staff. As designers of the stage and partners to the actors, they oversee scriptwriting, directing, lighting, and sound.
Star Role (Sei Role)
The ideal male image depicted through a female voice. A male role who leads the stage with charisma.
Color Role (Cai Role)
The pinnacle of elegance and heavenly number performance. A female role who divides the stage with the Star Role on equal footing.
SEISAIINTRO ▼2026
Creator's comments
Seisai / 2026GLOSSARY · CALENDAR · STAGESEISAI.AC
✦
✧
GLOSSARYGlossary
Sosei (雛生)1st Year. Chick Student
Kasei (華生)2nd Year. Flower Student
Seiyaku (星役)Male Role Specialist Actor
Saiyaku (彩役)Female Role Specialist Actor
Chansei-shiki (彩星式)July. First-year role determination ceremony
Hinamise (雛見せ)May. Official debut showcase for all first-years held in the small theater 'Subako'.
Hoshiyomi (星読み)Official casting announcement posted on a large board in the lobby each season. The day fate is decided.
Rakusei (落星)Punishment for being stripped of a role for the season due to stage accidents, management failures, etc. Possible to return next season.
Hoshi no Za (星の座)The highest honor awarded to the two joint leads (male and female role specialists) of the graduation performance. It is practically an official endorsement for the next top star, allowing entry into the Seisai Opera Company without an audition.
Hoshimori (星守)A time-honored citizen support culture unique to Seisai and a powerful fandom organization.
CALENDAR8 STAGES / 2 YEARS
Please check the titles of the seven performances directly on stage!
Y1·05 Hinamise "Meteor Shower Record"
The first stage where everyone performs before roles are decided.
The first stage where everyone performs before roles are decided.
Y1·07 Chansei-shiki The day male and female roles, and fate, are decided.
Y1·08 "???" The first official performance with new roles.
Y1·10 "???" The autumn stage where the first lead role competition begins.
Y1·02 "???" The year-end culmination. A stage where everyone must shine.
Y2·05 "???" The grand opening performance to become the master of the grand theater.
Y2·08 "???" Seisai's unique experimental performance in a modern genre.
Y2·10 "???" Higashioka Joint Competition. Clash of tradition and stars.
Y2·02 Graduation Performance "???"
The final stage where 'Hoshi no Za' is decided.
The final stage where 'Hoshi no Za' is decided.
FIRST STAGEMeteor Shower Record
At Seisai Music School's Hinamise, the same script is always performed. A traditional first story that everyone knows. "Meteor Shower Record" (流星雨レコード).
On the night a meteor shower not seen in a hundred years is predicted, a man enters an old record store. Kanata, who claims to be a wizard born from a meteor. If he cannot engrave the most beautiful sound before the meteor shower ends, he will lose his magic and memories. And the store owner, Mio—has a song she buried long ago.
Six roles: Kanata · Mio · Shun · Yomi · Fuuka · Yurie. 🎵 Listen to the Representative Number
On the night a meteor shower not seen in a hundred years is predicted, a man enters an old record store. Kanata, who claims to be a wizard born from a meteor. If he cannot engrave the most beautiful sound before the meteor shower ends, he will lose his magic and memories. And the store owner, Mio—has a song she buried long ago.
Six roles: Kanata · Mio · Shun · Yomi · Fuuka · Yurie. 🎵 Listen to the Representative Number
There is an old superstition at this school.
"The lead of Hinamise sits on the 'Hoshi no Za'."
"The lead of Hinamise sits on the 'Hoshi no Za'."
STATISTICSStats
This simulator uses a total of four stats. Each stat can be raised up to 100, and the role in the currently ongoing performance is determined by the total sum.
By default, {{user}} will be assigned to the role they desire, but if their stats are too low, they may not be selected for a lead or supporting role. The required stat values for each performance are not disclosed, but you can proceed without issue by occasionally attending classes/practices as time and the narrative progress.
By default, {{user}} will be assigned to the role they desire, but if their stats are too low, they may not be selected for a lead or supporting role. The required stat values for each performance are not disclosed, but you can proceed without issue by occasionally attending classes/practices as time and the narrative progress.
🎤 Vocal
A measure of pitch, volume, breath control, and the ability to deliver large musical numbers.
⚔ Physical
The overwhelming persuasive power of the body in dance, sword fights, waltzes, and group choreography.
📖 Interpretation
The ability to handle dialogue, the depth of emotional arcs, and understanding the director's hidden intentions.
✨ Presence
Star quality that forcibly immerses the audience, the ability to capture attention.
✦ Sub-Stats
• Condition (0~100): Decreases can cause stage accidents and injuries. If the value drops below 35 two weeks before a performance, or below 25 normally, you will receive a warning and be subject to Rakusei. Overwork increases stats but drastically lowers condition.
• Reputation (0~100): The trust level from faculty, audience, and peers. As it increases, so does the attention, but attention is always a double-edged sword.
• Reputation (0~100): The trust level from faculty, audience, and peers. As it increases, so does the attention, but attention is always a double-edged sword.
GUIDEFOR PLAYERS
🤖 Recommended AI Model
Recommended to start with Gemini 2.5 or 3.5 Flash. Models other than Opus 4.6 may cause widget output errors or be unsuitable for the simulator on the first turn. Opus 4.6 has low output volume, so it is recommended to use it for important acting & performances rather than from the beginning. If user impersonation is allowed, level 1 is recommended; if not, level 0. If you want to become a stage sensation, level 1 is strongly recommended.
✦ One-line evaluation of tested models
Gemini 2.5, 3.5 Flash (mixed with 3.1 Pro): Most stable for the beginning and produces characters well. Occasional foolishness requires a reroll.
Opus 4.6: Most stable but low output. Given the simulator's characteristic of talkative characters, it's recommended only for crucial moments rather than daily life. 4.7 is a bit more strict, and 4.8 doesn't follow output instructions.
GPT 5.4: A model where daily life and performances are 극명하게 갈리는 (sharply divided). In daily life, the dialogue is too verbose, and all of it is uninteresting. The sensory descriptions during performances are beautiful.
DeepSeek V4 Pro: Decent. If used for a long time, widget errors and sentence collapse may occur, so switching is recommended.
Sonnet series & GLM 5 & Base models: Difficult...
✦ One-line evaluation of tested models
Gemini 2.5, 3.5 Flash (mixed with 3.1 Pro): Most stable for the beginning and produces characters well. Occasional foolishness requires a reroll.
Opus 4.6: Most stable but low output. Given the simulator's characteristic of talkative characters, it's recommended only for crucial moments rather than daily life. 4.7 is a bit more strict, and 4.8 doesn't follow output instructions.
GPT 5.4: A model where daily life and performances are 극명하게 갈리는 (sharply divided). In daily life, the dialogue is too verbose, and all of it is uninteresting. The sensory descriptions during performances are beautiful.
DeepSeek V4 Pro: Decent. If used for a long time, widget errors and sentence collapse may occur, so switching is recommended.
Sonnet series & GLM 5 & Base models: Difficult...
🕹️ Play Guide
✦ Time Skip Recommended: Once you have sufficiently built up the narrative or stats for the week, please proceed to the next schedule. Of course, if you wish, you can enjoy delving into every single day.
✦ During practice times with no scheduled events?: If you don't know what to do, use the commands !class or !practice, or input one of the following: script reading / blocking check / costume check / stage rehearsal, and the AI will proceed appropriately!
✦ User Notes: Actively recommended for use. Recommended to record the roles each character takes in each performance / relationship changes / growth. Be sure to record any nicknames given by Gingga to {{user}} in your User Notes or Persona. Actively utilize the !summary command! The AI tends to forget script dialogue, so if there's a line you like during chat and want to quote throughout the performance, write it in your User Notes. You can delete it after the performance.
✦ Official Setting Errors: While we have tried to fix errors as much as possible, errors may still occur depending on the AI model's state, even if strongly prohibited. If an error occurs once, it tends to persist, so it's recommended to fix it immediately upon discovery!
A man appears!!!! / Meteor Shower Record becomes a script written by Tsubaki / Himawari suddenly becomes a senior student and becomes an older sister who has been cooking for a very long time / Everyone thought they were freshmen meeting for the first time, but why are they acting like they know each other? / The script seems strange (This is due to the lore book not being loaded properly. Please input the performance title and reroll.)
✦ What to bring: A mindset to enjoy
✦ During practice times with no scheduled events?: If you don't know what to do, use the commands !class or !practice, or input one of the following: script reading / blocking check / costume check / stage rehearsal, and the AI will proceed appropriately!
✦ User Notes: Actively recommended for use. Recommended to record the roles each character takes in each performance / relationship changes / growth. Be sure to record any nicknames given by Gingga to {{user}} in your User Notes or Persona. Actively utilize the !summary command! The AI tends to forget script dialogue, so if there's a line you like during chat and want to quote throughout the performance, write it in your User Notes. You can delete it after the performance.
✦ Official Setting Errors: While we have tried to fix errors as much as possible, errors may still occur depending on the AI model's state, even if strongly prohibited. If an error occurs once, it tends to persist, so it's recommended to fix it immediately upon discovery!
A man appears!!!! / Meteor Shower Record becomes a script written by Tsubaki / Himawari suddenly becomes a senior student and becomes an older sister who has been cooking for a very long time / Everyone thought they were freshmen meeting for the first time, but why are they acting like they know each other? / The script seems strange (This is due to the lore book not being loaded properly. Please input the performance title and reroll.)
✦ What to bring: A mindset to enjoy
⌘ Command Guide
!class [Subject Name] You can take classes in dance, singing, acting, or directing. Each can raise Physical, Vocal, Presence, or Interpretation stats, respectively. (Other stats may increase depending on the class content or the character's development.)
!practice [Character Name] You can practice with the selected character. Random stats increase depending on the practice content. Relationship changes with the character also occur, sometimes leading to growth for {{user}} or the character.
!summary Summarizes the last 30 turns of conversation. It helps with memory by utilizing User Notes and overall narrative summaries. Since the volume of two years is large, characters often forget, so using User Notes is highly recommended!
!epilogue Post-graduation epilogue. After the graduation ceremony, use this command to output an epilogue in letter format. We have prepared an ending song, so listening to it along with the epilogue is recommended. 🎵Song (Click to go to YouTube)
※ Gemini 2.5 recommended for summary and epilogue commands
!practice [Character Name] You can practice with the selected character. Random stats increase depending on the practice content. Relationship changes with the character also occur, sometimes leading to growth for {{user}} or the character.
!summary Summarizes the last 30 turns of conversation. It helps with memory by utilizing User Notes and overall narrative summaries. Since the volume of two years is large, characters often forget, so using User Notes is highly recommended!
!epilogue Post-graduation epilogue. After the graduation ceremony, use this command to output an epilogue in letter format. We have prepared an ending song, so listening to it along with the epilogue is recommended. 🎵Song (Click to go to YouTube)
※ Gemini 2.5 recommended for summary and epilogue commands
🎭 Persona Guide
The default is a first-year student in the 60th class of the Department of Stage Arts. Please write your aspirations for male/female roles, background, and motivations in your persona. Initial stats will be allocated based on your acting experience.
✦ When you can't think of how to play
{{user}}, who entered the school after being caught by someone important or a professor without knowing anything, {{user}} who knew someone among the NPCs in the past, try becoming a professor's favorite student, I was so jealous I tore up the script, get involved in a scandal with the person of the blue rose, try to film a love and war drama off-stage, Enjoy your youth!!
✦ When you can't think of how to play
{{user}}, who entered the school after being caught by someone important or a professor without knowing anything, {{user}} who knew someone among the NPCs in the past, try becoming a professor's favorite student, I was so jealous I tore up the script, get involved in a scandal with the person of the blue rose, try to film a love and war drama off-stage, Enjoy your youth!!
✎ Developer's Comment
Influenced by: Takarazuka Revue and Music School, Glass Mask (The person of the blue rose is an homage to Glass Mask!), Iwajima Opera School (Damdo Baekgyeong), Kageki Shojo!!, Jeanne d'Arc, Revue Starlight….
I've always wanted to create a simulator called 'Let's perform until I die' because I love the stage so much, but I knew I would never make it if not for this contest and the safety simulator. So I worked hard to make it. At first, I considered making male personas possible (a remnant of the playwriting and directing department...), but honestly, looking at the list of influences, it had to be a GL simulator. This is my first simulator, so I think I was too ambitious^^;> I feel like I spent the entire period fixing errors, but from the middle onwards, I realized that no matter how hard I tried, everything would depend on the AI's state and luck, so I let go a little…. I pray that the AI will do its best for all of you who play, and I'm entering prayer mode. If there are any serious errors that prevent progress, please leave a comment!
The most important thing I focused on when creating this was 'ensemble drama'! I love stories where {{user}} is the center, but the NPCs also interact with each other and show their individuality, so I worked hard on it, and I think it turned out as I intended. During the test play, I proceeded as a country girl who didn't know what acting was. I played a supporting role, helping characters grow, rather than a lead, and it was fun! The lore book only contains the synopsis + characters + lyrics of representative numbers, so everything else is the AI's creation. Just like countless stars, none of which are the same, please enjoy your own stage under the Seisai night sky^^7
+ I always prioritize immersion, so even if it's not perfect, I tried to create the atmosphere! I made the stage numbers using Suno, but since I couldn't create duet songs, I had to edit them by hand, so I couldn't match all of them to the time. I plan to upload all the assets (especially Tsubaki!!) and all performance numbers over the weekend. And after uploading, I realized I had written too much and it was suffocating, so I will organize the content neatly tooㅠ_ㅠ7
I've always wanted to create a simulator called 'Let's perform until I die' because I love the stage so much, but I knew I would never make it if not for this contest and the safety simulator. So I worked hard to make it. At first, I considered making male personas possible (a remnant of the playwriting and directing department...), but honestly, looking at the list of influences, it had to be a GL simulator. This is my first simulator, so I think I was too ambitious^^;> I feel like I spent the entire period fixing errors, but from the middle onwards, I realized that no matter how hard I tried, everything would depend on the AI's state and luck, so I let go a little…. I pray that the AI will do its best for all of you who play, and I'm entering prayer mode. If there are any serious errors that prevent progress, please leave a comment!
The most important thing I focused on when creating this was 'ensemble drama'! I love stories where {{user}} is the center, but the NPCs also interact with each other and show their individuality, so I worked hard on it, and I think it turned out as I intended. During the test play, I proceeded as a country girl who didn't know what acting was. I played a supporting role, helping characters grow, rather than a lead, and it was fun! The lore book only contains the synopsis + characters + lyrics of representative numbers, so everything else is the AI's creation. Just like countless stars, none of which are the same, please enjoy your own stage under the Seisai night sky^^7
+ I always prioritize immersion, so even if it's not perfect, I tried to create the atmosphere! I made the stage numbers using Suno, but since I couldn't create duet songs, I had to edit them by hand, so I couldn't match all of them to the time. I plan to upload all the assets (especially Tsubaki!!) and all performance numbers over the weekend. And after uploading, I realized I had written too much and it was suffocating, so I will organize the content neatly tooㅠ_ㅠ7
The Curtain Rises ✦
SEISAI™ EST.1967
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