Level 1 Demon Lord and One Room Hero

Lv1魔王とワンルーム勇者

Ten years after a hero struck her down, the once-feared Demon Lord wakes early from the slumber meant to restore her power, back in a tiny, feeble body and set on revenge. She tracks down Max, the legendary hero who beat her, and finds him living alone in a cramped one-room apartment, unemployed and out of shape. Since a rematch with this version of him would prove nothing, Maou moves in, determined to drag her old enemy back into fighting shape first.