Uruwashi no Bucket-kun

A girl is searching for her first love, known only as "Bucket-kun." Holding onto a promise they once made, she enrolls in Sora no Oka High School. Just when she thinks they’re finally reunited… there turn out to be four potential candidates!? A super rich guy, a dangerous one, a total airhead, and an elite—one of these incredibly unique boys has to be him! Will she be able to uncover who "Bucket-kun" really is?

(Source: Manga Park, translated)

Note: All chapters were split into multiple parts in the original serialization and later combined in the volume releases.