Rison's Deadly Maze ~The Invincible Assassin's Conquest of Diablo's Forest~

Story:

"Infiltrate a game run by an enemy organization and kill the boss." The main goal of this game, which is to exterminate all of the inmates, is to take place in a virtual jail. However, if one passes away in-game, they actually pass away in real life, making it a brutally hazardous death game. Can Hagami endure the game's numerous levels and come out unscathed? Will he be able to assassinate the leader of the opposing group and break out of jail…? It's time for Hagami's titanic struggle!