Hello, I am looking for two mangas, related to each other, probably as spin-offs.

One is about a guy who caught other guy on having sex with a girl and then he was forced by this guy to do it too. But that guy forgot ML's face and he even thought he had sex with a girl, so he organised a searching for this "girl" in school.

And the other manga is about a two other guys in that same school: one was a model, who was hinding his identity in school behind a spectacles and the second maybe was a model too, The thing is that they were sleeping together and the second guy didn't know that they are the same person, so he couldn't understand, why this particular classmate was so angry at him. I remember he even had a suitcase and he liked to beat him with that.

Sorry, I've read it a long time ago, so I'd be grateful if someone can help me find it. 😉