現実がゾンビゲー世界になってしまったけど僕だけがゲームシステムを使える (Associated Names)

“Congratulations on clearing the game. You have been chosen as a player.” Karamine Ritsu, a bullied boy at school. One day, after clearing the highest difficulty of the cooperative zombie FPS game “Dead Land 4,” a mysterious message appeared before Ritsu. According to the message, Ritsu can use the game system of “Dead Land 4”…