Suzume Yosano has lived in the countryside for all 15 years of her life, so when her parents decide to move overseas for work and leave her with her uncle in Tokyo, she finds herself in a completely new environment. On the way to her uncle's house, however, she gets lost and faints. Waking up safely at her uncle's house, she learns that a strange man had carried her there and that he happens to be an acquaintance of her uncle. Moreover, when Suzume goes to her new school for the first time, she discovers that the weird man in question, named Satsuki Shishio, is actually her homeroom teacher! Now, Suzume must adapt to her new school and make friends, since her blossoming high school life in the city has just begun!