Hiiragi Seiichi is an ugly, revolting, dirty, smelly fatass; these are the insults hurled at him one after another about his appearance. Such was Seiichi's daily school life of bullying, then for some reason...

Junpei Takeda, a high school student, is childhood friends with Noriko Tatsumiya and the bully Kido Shouta. One day, during the usual course of bullying Junpei, they were suddenly summoned to a different world...

A boy born from this world alongside the summoners from Japan... They will challenge the max-difficulty dungeon! God created a labyrinth, which people challenge with guns, swords, and magic in an RPG-like world...

A certain girl genius with more power than knowledge accidentally summoned dozens of students and teachers into a dangerous world filled with beasts and magic but the protagonist isn’t a student or the homeroom...