Lanthan of pumpkin head

In a town where a large number of dungeons surface, Lanthan is a boy who continues to conquer dungeons as a solo explorer. Within these days of loneliness and battle, Lantan had an encounter with a certain girl. This was the tall and lean, Leirion.
Due to the encounter with this girl with an appearance that contradicts her youth, Lanthan's lifestyle is transformed a little at a time...