After fighting his way to beat the demon king, the reborn Ceres is kicked out of his own adventuring party by the womanizing hero. Now alone, he heads to the market and Sees someone he never expectedーShizuko...

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...