(Ether) Akihime the Adventurer

The protagonist, who has no memories of themselves, is rescued by a girl called "Akahime" while lying collapsed. In return for saving her life, the girl asks him to live in her stead in a town built within a dungeon, since she is unable to move about freely. A lifestyle adventure story where the protagonist, possessing almost no special abilities, gradually builds the foundation for life while facing reality!