The story revolves around Kazuma Hoshino, a boy whose family moves to a new town for the sake of his younger brother's health. Kazuma gets lost on his way to his new school, but he unexpectedly encounters a girl named Ui Nakatsugawa. Ui guides him, but when Kazuma trips, he accidentally bumps into Ui and kisses her. Plus, Ui's close friend Ibuki Hinata happens to see the accidental kiss. Kazuma eventually meets Madoka Kōmoto (the daughter of a priest at the local shrine), a third-year girl named Tsumugi Tōdō, and Tsumugi's spirited younger sister Koyori.