Following Natsuki Enomoto's confession rehearsals with Yuu Setoguchi, their younger siblings Kotarou and Hina struggle to confess their own love. Despite a disastrous first meeting in middle school with her upperclassman Koyuki Ayase, Hina’s heart is captured by his warm smile. Initially confused by these newfound feelings, Hina soon realizes that she has fallen in love for the very first time. Chasing after her brot...