#Original
Arcbelly Labs: 21 Days of the Archeart Power Reactor
The fate of the two research institutes, who mock each other's papers, lies in your hands to jointly seize the heart of the rampaging king 21 days later.
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Published at 2026-10-10 | Updated at 2026-10-10
ARCVELLY UNIVERSE · EPISODE 6
📘 ───── 💠 ───── ⚙️
🔬 ARCVELLY LABS
21 Days of the Arkhart Power Core · ARCANA INSTITUTE vs MECHANIUM LAB
The core cracks with runes alone, and melts with machinery alone. The signatures of the two factions, who will hold the heart of the royal capital together in 21 days, are in your hands.
300 meters below the Arvelly Royal Capital, in the research sector Deep Core.
At its center breathes the blue-white core that powers the capital's lamp and the magic school's barrier.
Arcana Institute, which interprets magic through runic formulas, and Mechanium Lab, which manipulates magic through machinery and alchemy.
For 12 years since the White Static, the two factions have blamed each other.
But in 21 days, on the night of the Mana Convergence, the core reaches its critical point. It can only be stopped when runes and gears mesh together.
And you have descended as the new investigator with signing authority to the joint audit office between the two factions.
If you take one side, hearts draw closer, and the core wavers.
At its center breathes the blue-white core that powers the capital's lamp and the magic school's barrier.
Arcana Institute, which interprets magic through runic formulas, and Mechanium Lab, which manipulates magic through machinery and alchemy.
For 12 years since the White Static, the two factions have blamed each other.
But in 21 days, on the night of the Mana Convergence, the core reaches its critical point. It can only be stopped when runes and gears mesh together.
And you have descended as the new investigator with signing authority to the joint audit office between the two factions.
If you take one side, hearts draw closer, and the core wavers.
📘 ARCANA INSTITUTE · 아르카나 인스티튜트
Upper Control Room. What is unproven is not magic.
📘 Rosalyn
Magus · Acting Director · Head of Rune Core
Platinum blonde hair braided like a crown · Monocle · Rune circlet
Allow me to correct that, Investigator. It was the valve that failed.
Magus · Acting Director · Head of Rune Core
Platinum blonde hair braided like a crown · Monocle · Rune circlet
Allow me to correct that, Investigator. It was the valve that failed.
🔍 Fiona
Crystal Measurer · Core Readings Specialist
Lilac twin buns · Large white lab coat · Crystal lens
It’s within the margin of error… probably.
Crystal Measurer · Core Readings Specialist
Lilac twin buns · Large white lab coat · Crystal lens
It’s within the margin of error… probably.
♟️ Celeste
Mana Dynamics Theorist · Senior Lecturer
Wine burgundy half-updo · Long scarf · Pointer stick
Interesting, Investigator. You mean we didn’t solve it together.
Mana Dynamics Theorist · Senior Lecturer
Wine burgundy half-updo · Long scarf · Pointer stick
Interesting, Investigator. You mean we didn’t solve it together.
📚 Ophelia
Archivist Magus · Library Keeper
Midnight blue bob · Chain-bound ancient texts · Keyring
According to the records, the door opened twice.
Archivist Magus · Library Keeper
Midnight blue bob · Chain-bound ancient texts · Keyring
According to the records, the door opened twice.
🩺 Vivian
Magus Medic · Institute Infirmary
Pink side braid · Doctor’s bag · Rune stethoscope
Take a breath, Investigator.
Magus Medic · Institute Infirmary
Pink side braid · Doctor’s bag · Rune stethoscope
Take a breath, Investigator.
⚙️ MECHANIUM LAB · 메카니움 랩
Lower Engine Room. What spins is correct. Tighten, fix, blow it up, and tighten again.
🔧 Harper
Mechanical Engineer · Lab Chief · Cooling & Pressure Lead
Copper undercut · Brass prosthetic arm · Welding goggles
Let’s tighten it up, Investigator.
Mechanical Engineer · Lab Chief · Cooling & Pressure Lead
Copper undercut · Brass prosthetic arm · Welding goggles
Let’s tighten it up, Investigator.
🛠️ Gregor
Chief Engineer · Lab Veteran
Brown bearded giant · Steam-powered frame · Giant wrench
Hmph. Valves don’t lie.
Chief Engineer · Lab Veteran
Brown bearded giant · Steam-powered frame · Giant wrench
Hmph. Valves don’t lie.
⚗️ Penny
Alchemical Engineer · Coolant & Catalyst Specialist
Sunflower curly ponytail · Glass tube backpack · Safety goggles
When it bubbles up, it’s almost ready!
Alchemical Engineer · Coolant & Catalyst Specialist
Sunflower curly ponytail · Glass tube backpack · Safety goggles
When it bubbles up, it’s almost ready!
🦉 Noel
Automaton Engineer · Clockwork Specialist
Pure white hime cut · Clockwork owl · Gothic apron
The owl says the core’s hum is low.
Automaton Engineer · Clockwork Specialist
Pure white hime cut · Clockwork owl · Gothic apron
The owl says the core’s hum is low.
🪂 Ren
Test Pilot · Shaft Maintenance Glider
Teal spiky hair · Flight cap · Brass glider wings
The wind feels good! Going to the end of the vertical shaft!
Test Pilot · Shaft Maintenance Glider
Teal spiky hair · Flight cap · Brass glider wings
The wind feels good! Going to the end of the vertical shaft!
💠 CORE SYSTEM
🔬 Deep Core 21 Days · Six Time Slots · From morning to late night, the two factions inspect the core together every evening.
⚖️ Dominance · Between the Institute and the Lab, if one side gains the upper hand, the core becomes unstable.
💠 Stability · The core wavers with each joint inspection; it must last until the Mana Convergence night.
🧩 7 Clues · Find the truth of the White Static 12 years ago throughout the two factions.
💗 Affection · 10 individual affection levels; deepening hearts unlocks hidden scenes.
🌌 Mana Convergence Night · The path of theory, the path of engineering, and one path that does not open easily.
⚖️ Dominance · Between the Institute and the Lab, if one side gains the upper hand, the core becomes unstable.
💠 Stability · The core wavers with each joint inspection; it must last until the Mana Convergence night.
🧩 7 Clues · Find the truth of the White Static 12 years ago throughout the two factions.
💗 Affection · 10 individual affection levels; deepening hearts unlocks hidden scenes.
🌌 Mana Convergence Night · The path of theory, the path of engineering, and one path that does not open easily.
✦ Arcvelly Universe · Arcana Institute & Mechanium Lab ✦
Creator's comments
ARCVELLY UNIVERSE
🔬 Arcvelly Labs
Introducing the scientist groups, Arcana Institute and Mecanium Lab, as previously announced.
🔬 PLAY GUIDE
✨ Affection System: Increase the affection of each of the 10 characters. As your bond deepens, hidden scenes will unlock.
⏱️ Deep Core 21 Days: A day consists of six time periods, and each evening, the two factions jointly inspect the core. The night of the Mana Contrast arrives on the 21st day.
⚖️ Initiative · Stability: The core of this work is not about who wins, but how much it doesn't tilt. If you take only one side, the core will become unstable.
🧩 Clues · Endings: Uncover the truth behind the White Power Outage 12 years ago by collecting 7 clue fragments, with three different endings.
💬 Conversation Mode: Both widget-based choices and free conversation are available.
🎓 Universe Play: This power source also supplies mana to the barrier and lamps of Arcvelly Magic School. Under certain conditions, a familiar face from the magic school will visit.
⚠️ Precautions: Status is displayed on the widget. Prolonged free conversation may lead to inaccurate values.
🛡️ All Ages Viewing: All characters are adults. This is a wholesome laboratory drama/romance.
🎬 Recommended For You
✓ Those who enjoy stories where knowledge clashes with practice
✓ Those who enjoy relationships where rivals can't live without each other
✓ Those who enjoy a laboratory atmosphere
✓ Those who enjoyed Arcvelly Magic School, Hunters, Knights, and Borders
✓ Those who enjoy relationships where rivals can't live without each other
✓ Those who enjoy a laboratory atmosphere
✓ Those who enjoyed Arcvelly Magic School, Hunters, Knights, and Borders
💡 How to Enjoy
From the first day, the representatives of the two factions will try to get you to look at their data first.
Consider not just who to side with, but how to protect both.
There are strangely overlapping traces between people who appear to be rivals on the surface. Pay close attention.
There are three endings to the Mana Contrast night. One of them is not easily unlocked.
Consider not just who to side with, but how to protect both.
There are strangely overlapping traces between people who appear to be rivals on the surface. Pay close attention.
There are three endings to the Mana Contrast night. One of them is not easily unlocked.
📢 UPDATE NOTICE
We are starting with 3 episodes. Depending on the response, we will continue to add routes after the Mana Contrast night. Feedback is always welcome.
🌌 EXPANDING UNIVERSE
Works in the same universe
🎓 Arcvelly Magic School · Now Available
A prestigious school with 500 years of tradition, the beginning of all stories.
🏹 Arcvelly Hunters · Now Available
Shadowbane Guild | Crimson Hunters
⚔️ Arcvelly Knights · Now Available
Luminari Paladins, Guardians of Light
⛪ Religious Organizations · Now Available
Eternal Temple | Celestial Order
🏮 Allied Races Union · Now Available
Mistborn Alliance | Outland Coven
🔬 Scientist Groups · NOW
Arcana Institute | Mecanium Lab
Thank you for playing Arcvelly Labs
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