The episode follows two different couples navigating the tensions of youth and desire. Natsu invites Jun to watch a summer fireworks display from her room, leading to an intimate encounter, while Kana celebrates passing her entrance exams by claiming a long-awaited sexual promise from Ke-chan.
The episode explores the deepening intimacy of two couples as they reach major milestones in their relationships. While Mizuki and Kento navigate the awkwardness and excitement of their first sexual encounter, Akane and Icchan share a passionate night that culminates in a romantic marriage proposal.