For the past year, Waka Ninomiya has been having an affair with her husband's older brother. While her husband is away on a business trip, the two sneak off on a getaway, meeting secretly at a traditional inn. Suddenly, her phone rings—it's her husband calling. Flustered, Waka answers, only to hear her brother-in-law's voice on the other end. As they remain connected, he begins teasing and provoking her during the call. Gradually aroused, Waka struggles to suppress her moans, but her reactions only fuel his excitement further. The scene captures Waka inching closer and closer to her breaking point.