Makoto Hanaoka, a womanly second-year student, easily attracts other people's attention. First-year student Saki Aoi is no exception, and she falls in love with Makoto at first sight. Having a vibrant and vigorous personality, she does not hesitate to confess her feelings to her senior. However, Makoto differs significantly from the person Saki perceives: Makoto is not a girl, but rather a cross-dressing boy! After revealing his well-known secret to Saki, Makoto expects her to be disgusted. Surprisingly, she is instead captivated by this revelation. Nonetheless, he still rejects her, but Saki's determination does not stop her from declaring that she will become his first love. With Saki and his childhood friend at his side, Makoto's world brightens, giving him strength amid his struggle between his interests and the expectations placed on him.

In front of a camera, roommates Mao Tsuchiya and Hisashi Ootomo make three promises: Mao must not tell anyone Hisashi is gay and in a relationship with another man; Hisashi must never fall in love or make any advances on Mao; and one must not disturb the other's "personal time." Thus begins their second year of cohabitation. However, everything starts to crumble when the film club—of which Mao is a member—wants to cast Hisashi in the lead role for their upcoming movie. The problem arises with the movie's plot, as it is about boys' love—a romance between a delinquent and the class president. Mao is adamant to dissuade Hisashi from becoming the protagonist due to their first promise; but, to his surprise, Hisashi is easily convinced by the director. After imagining Hisashi as the delinquent he is playing, Mao becomes overly conscious of his presence. He knows Hisashi is just a friend and out of his reach, but Mao cannot keep lying to himself anymore—his feelings toward his roommate may no longer be purely platonic.