12-sai.

Sixth-grader Hanabi Ayase is beginning to notice feelings she does not know how to explain. Her classmate Yuuto Takao seems different from the other boys, and practicing the recorder together draws them into awkward questions about affection and what it means to like someone.

With her friend Yui, Hanabi navigates a world that feels newly complicated even though school and familiar faces remain the same. Classmates' remarks, misunderstandings and small unforgettable moments shape the girls' first experiences of love, long before either has clear answers about growing up.