Lf doujin/manga: Neet likes a student and is jealous that they have a boyfriend and falls off their building but he possesses her

Hey, I'm trying to find a manga/doujin I read a while ago. I remember that it was about a guy who was this otaku neet guy. And he had a crush on this girl and one day he sees she has a boyfriend and he couldn't accept it or something and he falls off the railing and dies. Later he wakes up possessing her, and then he uses her body to cheat on the guy and send pictures to her boyfriend. Then the boyfriend commits suicide and the guy also does something but later the boyfriend wakes up in her body. And then the doujin ends.