The tutorial dungeon exists to help players understand the mechanics of the game. As the first dungeon, its boss is weak—extremely weak. Anyone losing to this guy practically doesn’t deserve to play the game. The protagonist, however, has reincarnated as this weakest boss, Evilham, an ogre who stands at the very bottom of the monster hierarchy.
Knowing all too well how weak Evilham is from his previous life of gaming, the protagonist quickly decides there’s no point in resisting defeat and resolves to enjoy a peaceful, low-profile life while he waits for the inevitable arrival of the hero. But things take an unexpected turn: nearby villagers start to take a liking to him, and even the hero decides Evilham isn’t really a bad guy, letting him off the hook.
Growing fond of this lifestyle, Evilham embraces his daily life, steadily expanding the dungeon while enjoying a relaxed, peaceful existence.