Adachi to Kentarou no Kakushigoto.

Kentarou, a shy and soft-spoken college student, has a crush on Adachi, a bright and popular classmate. Until now, Kentarou has only had cats to talk to, but thanks to Adachi's openness, they have become friends enough to have a drink at home alone together. Kentarou is happy to be with Adachi even as a friend. But there is one more secret that he can't tell. Adachi, who is drunk and has lost his memory, doesn't know that he is holding... him. Kentaro feels guilty for taking advantage of his lack of memory to have sex with him, but...