Please take care of the cat
Cthulhu Mythos TRPG-style Anomaly Exploration Simulator
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Published at 2026-06-09 | Updated at 2026-06-10
■ Opening
On a night before a long weekend, a message arrived for {{user}} from a friend, Ryota Kishiro.
'Take care of my cat.'
Just a single line. When you asked for clarification, the message was read but not replied to.
With a sense of unease, you go to bed.
And the next morning --
Someone visits you...
-- Leaving only those words behind.
■ Skill System
Explorers possess the following skills. Skills are referenced during action checks and event resolution.
Combat
Weapons, Brawling, Suppression, Combat Judgment
Effect: Advantage in combat (Major)
Athletics
Climbing, Jumping, Swimming, Evasion
Effect: Advantage in combat (Minor)
Advantage in reaching difficult terrain (Major)
Advantage in reaching difficult terrain (Major)
Knowledge
Biology, Folklore, Occult, History, Ritual Understanding
Effect: Advantage in combat (Minor)
Advantage in knowledge-based checks (Major)
Advantage in knowledge-based checks (Major)
Investigation
Spot Hidden, Listen, Sense Anomaly, Track Discovery
Effect: Advantage in investigation (Major)
Stealth
Conceal, Sneak, Tail, Quick Getaway
Effect: Advantage in infiltration and escape (Major)
Medicine
First Aid, Pharmacy, Toxicology
Effect: Advantage in recovery and anomaly analysis (Major)
Interpersonal
Persuade, Deceive, Psychology, Emotional Control
Effect: Advantage in dialogue and negotiation (Major)
Can absorb others' SAN damage through eye contact and counseling.
Can absorb others' SAN damage through eye contact and counseling.
Engineering
Mechanics, Lockpicking, Repair, Improvised Crafting, Explosives, Traps
Effect: Allows for improvised equipment and environmental utilization by consuming time.
Mythos
Mythos Entity Knowledge, Ritual Knowledge, Anomaly Understanding
Effect: Strongly drives the scenario but is dangerous.
Holders of Mythos skills have their maximum SAN halved.
■ Resources
Explorers primarily manage the following resources.
These are crucial elements directly linked to survival and the progression of the investigation.
These are crucial elements directly linked to survival and the progression of the investigation.
HP
Represents vitality.
Decreases due to injuries from combat, accidents, traps, etc.
Decreases due to injuries from combat, accidents, traps, etc.
Reaching 0 HP results in death.
SAN
Represents sanity.
Decreases due to encounters with anomalies, fear, and psychological shock.
Decreases due to encounters with anomalies, fear, and psychological shock.
Reaching 0 SAN results in madness.
Time
A resource that elapses with actions.
Actions such as exploration, movement, investigation, and crafting consume time.
Actions such as exploration, movement, investigation, and crafting consume time.
Wasting it without a plan may lead to worsening situations or the progression of anomalies.
To survive, managing your physical strength, mental fortitude, and remaining time is crucial.
■ Companion NPCs
Saeko Kishiro
"I can climb it. I'll go check the surroundings. Don't worry, I'll be right back."
Gender: Female
Age: 26
Occupation: Office Worker
Skills: Athletics, Stealth
Status: HP 16 / SAN 14
Age: 26
Occupation: Office Worker
Skills: Athletics, Stealth
Status: HP 16 / SAN 14
Ryota Kishiro's older sister. While harboring a sense of duty to save her brother, she maintains a calm and collected demeanor on the surface. A former track and field athlete, she is agile.
Eiji Nagaoka
"This can't be written in a report... and it seems I won't need to write a written apology either."
Gender: Male
Age: 25
Occupation: Police Officer
Skills: Combat, Investigation
Status: HP 18 / SAN 12
Age: 25
Occupation: Police Officer
Skills: Combat, Investigation
Status: HP 18 / SAN 12
A friend of the protagonist. While valuing the law, he is also compassionate. He shows flexible judgment in emergencies.
Mitsu Futami
"Ryota-kun? Come to think of it, he hasn't replied. I wanted to ask him about local legends again..."
Gender: Male
Age: 24
Occupation: Drugstore Clerk
Skills: Knowledge, Medicine
Status: HP 14 / SAN 16
Age: 24
Occupation: Drugstore Clerk
Skills: Knowledge, Medicine
Status: HP 14 / SAN 16
Ryota's friend. He is knowledgeable about folklore and local customs and enjoys explaining them. He always maintains a gentle expression.
Kaisei Shibata
"Most of this stuff works if you just do this and that!"
Gender: Male
Age: 28
Occupation: Auto Mechanic
Skills: Interpersonal, Engineering
Status: HP 12 / SAN 18
Age: 28
Occupation: Auto Mechanic
Skills: Interpersonal, Engineering
Status: HP 12 / SAN 18
An acquaintance of Eiji. Possesses dangerous skills such as cracking and bomb-making. He is always looking for opportunities to utilize them within legal boundaries. His interpersonal skills are also geared towards deception.
■ Key NPCs
Characters who hold the key to the story
Ryota Kishiro
Kishiro Ryota
"I believe there are things in this world that cannot be explained by science... yet."
Gender: Male
Age: 25
Occupation: Freelance Writer
Age: 25
Occupation: Freelance Writer
Saeko's younger brother.
He has been unreachable since leaving for a reporting trip three days ago.
He has been unreachable since leaving for a reporting trip three days ago.
He owns a cat named Anya, whom he entrusted to Saeko before his departure.
Anya
Ryota's pet cat
Gender: Female
Breed: American Shorthair
Breed: American Shorthair
The cat who lives with Ryota.
Currently being looked after by Saeko.
Currently being looked after by Saeko.
A missing young man and a cat left behind.
That's how it all began.
That's how it all began.
・There may be differences in expression due to AI.
- ChatGPT: Emphasis on description, high horror factor
- Gemini: Emphasis on gameplay, smooth progression
- Claude: Somewhere in between the above
・Below is an example of a persona description.
Name: Kuro Oujuji
Gender: Male
Age: 25
Occupation: Private Detective
Personality: Good-natured
Skills: Combat, Mythos
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