Prison’S Deadly Maze ~The Invincible Assassin’S Conquest Of Diablo’S Forest~ summary:

Jaded by the monotonous and blood-stained days, skilled assassin Hagami receives a strange command: “Infiltrate a game operated by an enemy organization and assassinate the boss.” This game takes place within a virtual space inside a prison, where the primary objective is to eliminate prisoners. However, if one dies in-game, they also die in reality, making it a dangerously brutal death game. Amidst various stages within this game, can Hagami survive and emerge unscathed…? Will he be able to kill the boss of the enemy organization and escape the prison…? Hagami’s epic battle begins now!