Love Graduation - Our Three Years

Synopsis

Fujisaki Asuka has had a crush on Urabe Jun for three years. Days before graduation, to her surprise, he asks her to be his girlfriend. But there's a catch, he actually wants her to pretend so other girls won't swarm around him. Asuka is disappointed, but for her, just being around him is enough. She decides to enjoy spending time with him while she can, but jealous girls aren't happy with the new "couple". (Source: MangaUpdates)