The Grade 5B Case Files
A narrative AVG focused on everyday mysteries from the lives of elementary school students. The two protagonists encounter ordinary yet unusual incidents at school, and through investigation and deduction, players uncover the truth together with them.
Estimated lifetime revenue
Free-to-play
Revenue comes from in-game items and microtransactions, which our price-based model doesn't estimate. The player count below is how many people own it, not what they spent.
Est. players
3.7K
people who own it
Reviews
137
Review score
91%
9.1/10
Concurrent players
3
read Sep 17, 2026, 15:00 UTC
Followers
About
About the game
Open the notebook and explore seemingly ordinary yet mysterious incidents together with two girls!
Watsonia, a student in Grade 5, Class B at Seashell Elementary School, buys a notebook at a stationery store. At the time, she has no idea what she wants to write in it—she simply finds the cover cute and decides to buy it. This notebook becomes the starting point that brings Watsonia and her classmate Holmlyn together as a team of two, investigating and deducing unusual incidents hidden within daily school life.
To others, these incidents may seem like something trivial caused by children. But for Holmlyn and Watsonia, each one of them is a difficult “case” .
As the mysteries unfold one by one, a larger picture of life in school gradually emerges.With Holmlyn, who is a detailed-oriented and action-driven person, and Watsonia acting as her “assistant” who carefully records every clue, the two work together to uncover the truth behind each case. Along the way, classmates, teachers, and students from other grades all make their appearances, forming a fair-play mystery story set within the school.
As the player, you will collect clues, conduct investigations, think things through, and make correct deductions alongside them. Watsonia records all clues in her notebook—if you ever feel lost, try opening it and taking another look.
Watsonia:
A cheerful and innocent elementary school girl in Grade 5, Class B at Seashell Elementary School. She’s neither particularly noticeable nor invisible—just an ordinary student. She enjoys buying things she personally finds cute, though her taste isn’t always mainstream.
Holmlyn:
A quiet and reserved elementary school girl in Grade 5, Class B at Seashell Elementary School. She doesn’t have any especially close friends in class.
She is passionate about origami crafts and also has an interest in sprinting.
The game features a linear, chapter-based narrative structure, with seemingly ordinary incidents gradually forming a complete story.
The game consists of 5 chapters, each taking about 1 hour to complete.
Chapter 1 is released for free and offers a complete standalone story experience.
Chapters 2–3 will be released simultaneously as DLC.
Chapters 4–5 will be released later as DLC following the earlier chapters.
As the chapters progress, the story will gradually unfold.
This title also serves as the starting point of a series. Future works set in the same theme and setting are planned.
The series is expected to consist of multiple titles, each containing around five chapters, continuing to record mysteries hidden within everyday life.
Press Shift to open the menu during dialogue or free investigation where you can check items or save game
Press Z or Enter to confirm or investigate
Press X or Esc to cancel or close the menu
Press S to fast-forward
Press Q or scroll to view the log
Press F5 to quickly return to the title screen
Use ↑↓←→ to move the character in explorable scenes
Scenario & Programming: Teacher Li（狸老师）
Art: 坐标zahyou
Publisher: Eternal Dream Studio
(Referenced materials are listed in the in-game credits)
