Kore wa Akumade Yume nanode

Harumi, a popular employee at a host club, encounters a man passed out in an alley and takes pity on him, bringing him home to recuperate. When he goes to sleep, a strange thing happens: he has a sexual dream about the man sleeping in his living room.

The next day, Harumi finally finds out the man's identity—he is Forni, an incubus who had collapsed due to his inability to harvest life energy by consuming humans' ejaculate. Worried that Forni would faint again should he leave—and intrigued by the prospect of a non-committal relationship—Harumi volunteers to help him out until he is capable of seduction alone. However, their lives further intertwine, and they both begin to consider what exclusivity would mean for their relationship.