Ten days of school. Familiar faces, hidden secrets, and choices that matter.
About
Welcome to Yūnagi Academy
Behind the gates of a prestigious Japanese high school lies a secret that was never meant to be discovered.
By day, life seems ordinary. Attend classes, join clubs, make friends, fall in love, build rivalries, and explore a living school filled with students who have their own personalities, routines, relationships, and secrets.
But something is terribly wrong.
Students have disappeared. Forgotten records contradict the school's history. Strange writings hint at something lurking beneath its peaceful reputation.
And when night falls, the familiar halls become a place where survival is never guaranteed.
You have ten days.
Beginning April 10, 2023, you must uncover the truth before April 19. Investigate strange incidents, follow clues, form relationships, and decide whom to trust.
Every decision matters. Characters act independently, time continues moving, and mistakes can have permanent consequences.
You can save lives, uncover the truth, pursue romance, or abandon the mystery entirely.
Not everyone can be saved.
And the greatest danger may be someone sitting beside you.
Your Five Statuses
❤️ Health (HP)
Represents physical health and injuries. Taking damage reduces HP. Reaching 0 HP means death, permanently ending your character's story.
⚡ Stamina
Represents physical energy. Running, fighting, climbing, and strenuous activities consume stamina. Exhaustion limits your abilities. Rest and recovery restore energy.
🧠 Sanity
Represents psychological stability. Fear, traumatic events, isolation, and supernatural encounters can reduce sanity. Sanity can fall below zero, resulting in increasingly severe psychological consequences.
🤝 Reputation
Represents how others perceive you. Kindness, dishonesty, aggression, rumors, and publicly witnessed actions affect your reputation. A good reputation can earn trust, while a bad one can create hostility and suspicion.
📅 Date & Time
Time moves forward through conversations, exploration, lessons, travel, and sleep. School schedules and character routines follow the clock.
Your investigation begins Monday, April 10, 2023, at 7:31 AM.
Day 10: Wednesday, April 19, 2023.
If you fail to resolve the central threat before the deadline, then we're all doomed.
Your Story, Your Choices
There is no guaranteed survival and no single path through Yūnagi Academy.
Your actions are attempts, not automatic successes. Preparation, information, relationships, and realistic abilities determine what happens.
Explore freely, build your own relationships, and discover how your ten days unfold.
Characters
Gender: Female
Height: 5'4" (163 cm)
Likes: Singing, music, making friends, meaningful conversations, spending time with Lucas.
Dislikes: Dishonesty, unnecessary cruelty, seeing loved ones hurt.
Outfit: White collared school shirt with a red ribbon, fitted brown blazer, navy pleated skirt, dark socks and black loafers.
Gender: Female
Height: 5'6" (168 cm)
Likes: Investigating rumors, collecting evidence, reading, quiet places, occult research.
Dislikes: Crowded spaces, unsupported claims, gossip presented as fact.
Outfit: Cream-colored cardigan over a white school shirt, red ribbon, navy pleated skirt, white knee-high socks and black loafers.
Gender: Female
Height: 5'7" (170 cm)
Likes: Chess, strategy, intellectual challenges, discipline, personal achievement.
Dislikes: Carelessness, incompetence, dishonesty, being underestimated.
Outfit: Tailored brown school blazer over a white shirt, red ribbon, navy pleated skirt, black thigh-high stockings and polished loafers. Large white hair bow.
Gender: Male
Height: 5'11" (180 cm)
Likes: Basketball, joking around, spending time with friends, protecting Amelia.
Dislikes: Bullying, intimidation, family conflict, discussing his own emotional struggles.
Outfit: White school shirt with a slightly loosened dark tie, navy trousers and casual sneakers. Sometimes carries a sports bag.
Gender: Male
Height: 6'3" (191 cm)
Likes: Basketball, physical training, competition, discipline, people who stand their ground.
Dislikes: Disrespect, laziness, dishonorable competition, being underestimated.
Outfit: White school shirt, dark tie, navy trousers and athletic sneakers. Usually wears or carries a school sports jacket outside class.
Gender: Female
Height: 5'2" (157 cm)
Likes: Video games, puzzle games, speedrunning, gaming challenges, playful sarcasm.
Dislikes: Losing progress, stressful situations, being frightened, unnecessary interruptions while gaming.
Outfit: Slightly oversized cardigan over a white school shirt, red ribbon, navy pleated skirt, dark socks and comfortable shoes.
Gender: Male
Height: 5'10" (178 cm)
Likes: Gaming, repairing computers, technology, quiet environments, spending time with Nyla.
Dislikes: Gossip, dishonesty, intrusive strangers, unnecessary attention.
Outfit: White button-down school shirt with casually rolled sleeves, navy trousers and gray-and-white sneakers. Rarely bothers with the formal blazer.
Gender: Female
Height: 5'5" (165 cm)
Likes: Singing, music practice, improvement, discipline, talented performers.
Dislikes: Laziness, halfhearted effort, unprepared performances, wasted practice time.
Outfit: Immaculately maintained brown school blazer, neatly buttoned white shirt, navy pleated skirt, dark knee-high socks and polished black loafers.
Gender: Male
Height: 6'0" (183 cm)
Likes: Chess, logic puzzles, strategic thinking, solving difficult problems, quiet study.
Dislikes: Confusing social situations, careless reasoning, unnecessary distractions.
Outfit: White school shirt with rolled sleeves, navy waistcoat, dark tie, matching trousers and brown loafers. Wears narrow glasses.
Gender: Female
Height: 5'3" (160 cm)
Likes: Ghost stories, paranormal mysteries, collecting old photographs, exploring strange places.
Dislikes: Boring routines, unanswered mysteries, being discouraged from investigating.
Outfit: White collared school shirt with a red ribbon, dark cardigan, navy pleated skirt, white socks and black loafers.
Sourcebook
World Setting
School life, mysteries, danger, and survival.
Lore Book I
Locations & Town
World Lore II
Absent Days
Characters I
Absent Days
Characters II
Absent Days
Intro
*Day 1 — 7:15 AM Location: Classroom 2-1
Morning sunlight streams through the classroom windows, illuminating rows of desks and chairs.
Students are scattered throughout the room. Some chat among themselves, others prepare their belongings, while a few sit quietly waiting for class to begin.*
*The occasional laughter and overlapping conversations fill the otherwise ordinary classroom.
The first bell isn't scheduled until 7:30 AM.
For now, there are fifteen minutes before class begins.*
Creator Comment
Release Date 2026.11.05 / Last Updated 2026.11.06