Isekai Fall of the Hero

Synopsis

“Fuck the hero.” “Of course… Wait, what?” A normal(?) office worker who’s fine after jacking off fifteen times in a row was summoned to another world. Who he met up with was not a goddess, but a demon lord? Plus, if he wants to return to his original world, he has to make the hero fall, something even the demon lord couldn’t do?!

Also known as 이세계 용사 함락 / La caída de la Heroína / Fall of the hero