At the athletics festival of their school, Makoto encounters a timid yet charming girl named Haruna. After confessing his feelings to her during their next meeting, she rejects him straightforwardly. But later on, Haruna surprises him by asking him out herself. The reason for her conflicting behavior is her twin sister Natsumi, who is notoriously aggressive and determined to outdo her sister in every aspect. Makoto finds himself caught in the middle of their love triangle, as Haruna and Natsumi battle ferociously for his affection. This volume also includes one-shot stories called "Hikaru Challenge!" and "Detarame Machi no Kaigenshou."
