Kimura-san wants to get close to her crush Mizushima-kun, but the beautiful and confrontational Hiyama-san has a problem with that... though it's not the kind of problem you'd expect from this scenario. (Source: MangaDex)

Shoujo Manga Shujinkou x Rival-san began as a web comic on the author's Twitter and pixiv accounts on May 24, 2019. The first volume containing the web chapters with extras was released by Square Enix on April 22, 2020, and serialization began in Gangan Joker on the same day.