Mitsu Iro Devil

Rin Hashiba lives together with her grandpa. One fateful day, while offering a prayer to God at the temple, a demon named Char appears before her. Seeking the blood of a virgin, Char is lewd, mean, and quite full of himself. He may act high and mighty, but in reality, he's very loving and kind. Even though she knows it's forbidden, Rin's body and mind are bound to fall into the demon's clutches one day...

(Source: Renta!)