I, Alice, an ordinary transmigrator, accidentally became a hero and, without realizing it, pretended to be the Demon King... Now, I'm forced to live as a double agent between humans and demons, constantly...

Masuda Keima, a lazy high-school boy who prefers to laze around and avoid working, gets summoned as a dungeon monster by a girl avatar named "Dungeon Core No. 695" who is the dungeon core of the mighty one-room...