Hana, a 16-year-old tomboy, is dumped by her boyfriend after moving to Sapporo following her parents' divorce. On her first night in the city, she encounters a young man who appears too ill to walk. He collapses onto her and is rushed to the hospital. It turns out he is Hiroto, her new next-door neighbor. The next day, on her first day at her new school, she discovers that he is actually a teacher—and specifically, the teacher of her class! Despite his outgoing personality and friendly demeanor, which help him get along with everyone, she notices something slightly different about his interactions with Nishiwaki, a classmate whom others dismiss as a "cold-hearted beauty." Hana frequently runs into him on her way to school, and as she gets to know him better, she finds herself falling for him. Things become even more complicated when her ex-boyfriend, who broke up with her, arrives in Sapporo claiming he wants to give their relationship another chance!