Akari is getting engaged, and her mother's close friend decides to throw a celebration at her house. Haruki joins them, and they all enjoy a pleasant evening together. However, when the mother gets drunk and falls asleep, Akari suddenly approaches Haruki and completely changes her demeanor. Haruki, a virgin, tries to convince himself that Akari is only acting so boldly because she's intoxicated, attempting to stay calm—but Akari's actions grow increasingly aggressive. The unfolding scene and the dynamics between the two take an unexpected turn.