Do men in their 40s dream of a slow life?

A 38-year-old single man, exhausted with life, is killed by a thug in a park at night—only to awaken inside a dungeon. Beside him stands a sharp-tongued high school girl, and for some reason, he has become younger.

Determined to rebuild his life, the man in his 40s begins anew: defeating monsters, completing requests, and aiming for a slow, steady life. But first, he must escape a dungeon overrun by the undead.

The story also includes a harem element, with four characters already won over.