The narrative centers on a love triangle involving the male lead, Makoto, and the two heroines, Kotonoha and Sekai. Makoto becomes infatuated with Kotonoha, a girl in his grade but a different class. Even though they commute to school on the same train, she remains oblivious to his presence. His classmate, Sekai, orchestrates their meeting, despite harboring deep feelings for Makoto herself.