For two years now, a succubus named Tsukasa and an ordinary guy named Rui have been living under the same roof of a human house. Tsukasa lived with Rui only so that he could satisfy all his sexual needs. But soon Tsukasa became attached to Rui, he didn't think he could fall in love with a guy, Tsukasa thought that if he was a succubus by nature, then he didn't have romantic feelings, but Rui became special to him.

"Good night, my dear Rui."

Tsukasa said in a soft and sweet voice.