As summer tensions rise in Mujikaku na Osananajimi to Kyoumi Honi de Yatte Mitara The Animation, Hiroki grapples with growing jealousy after seeing his childhood friend Meiko with a classmate. Urged by his sister to face his feelings, he races to the fireworks festival where Meiko waits in her yukata. There, a long-overdue confession transforms their uncertain bond into something warmer and more genuine, bringing their story to a heartfelt close.