Kigengire no Hatsukoi

Uno has someone he can't forget. He always had unrequited feelings for Murakami, who was popular with everyone even after graduating from university. He tries to put away his feelings by going to his friend's wedding, hoping to meet Murakami there one last time, but he finds out that Murakami is in debt and went missing! Murakami has lost everything and become homeless. Uno finds him, takes him in, and tries to conclude his unrequited love by living with him.

(Source: Libre, translated)