The Prison Boys is a visual novel with adventure game elements taking place at the end of the Taisho period in Japan with some of the events mentioned in the game based on real events. Players take the role of Tetsu Akatsuki, a member of a special police force serving in a 12-story prison. Having found his superior hanged in his room, Tetsu decides to investigate the circumstances of his death and uncover the mysteries hidden in the prison walls.

Players will spend a lot of time reading through text with occasional choices being given at certain points and going to various places. Apart from looking for items and using them, players will also need to solve a number of puzzles during the game. As a bonus, players can locate hidden cards which will give them more backstory about each character in the game. Also, players will have to interrogate other characters and can use items, as well as tap on another character's portrait to make people tell the truth or cooperate with them. The game features multiple endings based on the choices and actions of the player, which impact the relationships between the characters. During the interrogation, choosing the wrong options, items or characters will decrease the life bar and may lead to bad endings.

It's at the end of Taisho era.

The main character, Tetsu Akatsuki witnesses an incident in 12-Story Prison which is one of hub of Secret Police…

The closer he gets to the truth, the more he finds that the dark of 12-Story Prison is deep.

Holding your own sense of justice in mind, solve the mysteries together with your partner!

The mystery novel adventure game about the justice and friendship between Tetsu and Nagi, who put their lives at risk.