kanansama is easy as hell

Kanan is a demon hiding in a high school in the human world to feed on the souls of humans. She sets her sights on a single high school boy, but somehow ends up in a lovers contract with him!? Kanan, who has never been in love, is now filled with new feelings! The romantic comedy of a pure-hearted demon's first love, begins! (Source: Shounen Magazine, translated)