After the successful cultural festival, Class 1-B receives a special award, with Uka Ishimori's dedication being honored. The class celebrates together, but Uka secretly reflects on her growing emotional attachment to Kai Miura, who accompanies her after the festival and spends private time with her for the first time, such as at an arcade. Meanwhile, Serina Kanno, Kai's ex-girlfriend, reveals her past: In middle school, she was bullied due to misunderstandings until Kai protected her, which shaped her dependence on him.

During the summer festival, tensions escalate: Uka realizes that her feelings for Kai go beyond admiration and admits this to herself after observing how Serina and Kai interact distantly due to rumors. When Ayumi invites Uka to the festival to cheer her up, Uka unexpectedly runs into Kai, who is looking for her and breaks through her reserve. In an emotional key scene, Uka publicly confesses her love for Kai to Serina, which encourages Serina to reassess her own feelings.

The episode ends with the fireworks, symbolizing Uka's inner conflict: She can no longer hide her love but accepts the complexity of the relationships around her. Serina encourages her to stand by her feelings, while Kai continues to play an ambivalent yet present role in her life.