Yuusha-chan no Bouken wa Owatteshimatta

The protagonist of the hentai is a real hero. She single-handedly defeated the Demon King and saved the world. But the girl is not going to rest on her laurels. She goes on a journey to eradicate the remnants of the army of deomons. But all along the way she is plagued by strange unexplainable lecherous nightmares.