I'm the Hero, but the Demon Lord's Also Me, Vol. 1

Yuuma Tsugari is an ordinary high school student whose family runs a publicbath house. He leads a peaceful, uneventful life, but all that changes when abeautiful woman from another world appears before him, certain that he's thehero she's been searching for! Sure, he's no hero, but how can he refuse such abeauty...!?