High-school junior Sosuke Hanada catches his new girlfriend making out with some random hot guy. To make matters worse, it turns out said hot guy, Natsuki Kirishima, just transferred to his class and gets seated right next to him! Sosuke can't stand how Natsuki toys with him, but at the same time, finds him sweet in just the right moments... Sosuke lets his guard down for just a second, which is enough time for Natsuki to steal Sosuke's first kiss!