Jin, an adventurer so overwhelmingly strong that he can cut down a three-headed dragon with a single slash! Though he craves more power, he fears that becoming any stronger would turn him into a monster… so he retires from adventuring and returns to his hometown café, in Dagar! However, in the mountains behind his family home lies a dungeon said to grant one's “deepest desires”…!? Together with Shuna, a runaway saint who suddenly barges into his life, the power-hungry former adventurer sets out to conquer the dangerous, monster-filled dungeon! And after the battles, they savor exquisite dungeon cuisine made from the monsters they defeat—!? The thrilling second life of the strongest former adventurer begins in grand style!