Fifteen-year-old country girl Suzume Yosano has to move to Tokyo to live with her uncle due to her father's transfer. She bumps into a mysterious man who ends up taking her to her uncle's place after she gets lost. Turns out, Suzume will be seeing him a lot more often once she starts school because... he's her homeroom teacher?!

Yuna has a crush on Haru. She sees him on the train every morning when she goes to school. She doesn't know anything about him and he goes to a different school from her. One morning, she wakes up and finds Haru sleeping right next to her.