Age 12.

Hanabi Ayase and Aoi Yui are two 12-year-old girls navigating the challenges of pre-adolescence. Ayase has a negative view of boys due to her mischievous classmates, but her perception changes when she's paired with Takao Yuuto for a school project. The two share a romantic moment on the school rooftop, marking their first kisses. Meanwhile, Aoi develops feelings for Kazuma Hiyama after he defends her from a rejected suitor.