I'm the Hero but the Demon Lord's Also Me Vol. 1 Manga
(W) Akiyoshi Ota (A) Tatsuya Endo
Yuuma Tsugari is an ordinary high school student whose family runs a public bath house. He leads a peaceful, uneventful life, but all that changes when a beautiful woman from another world appears before him, certain that he's the hero she's been searching for! Sure, he's no hero, but how can he refuse such a beauty?