High school student Makoto enters his new school year with a single goal: to finally get a girlfriend. He quickly develops feelings for Morigata, the pretty girl who sits next to him in class. Unfortunately for Makoto, Morigata has eyes only for Nanagi, a handsome and academically brilliant boy who seems to excel at everything. Driven by rivalry and jealousy, Makoto repeatedly challenges Nanagi in various contests, only to lose every time. Despite his competitive failures, Morigata comes to appreciate Makoto's honest and earnest personality, and the two begin a gentle, platonic romantic relationship.

Just as Makoto's dream appears to be coming true, Nanagi suddenly confesses to Makoto out of nowhere, throwing the budding romance into chaos. What follows is a love triangle that defies easy categories, as Makoto finds himself caught between his first girlfriend, Morigata, and his first boyfriend, Nanagi, in a secret and forbidden entanglement. The story explores the confusion, humor, and emotional intensity of navigating two very different relationships at once, with each connection pushing Makoto to understand his own feelings and what he truly wants. The narrative unfolds through key school events, private dates, and tense family encounters, building toward a resolution that forces all three characters to confront the limits of their triangular arrangement.