Honami and her husband Tooru have always enjoyed a passionate marriage, having sex almost daily, even after their son Kenji grew up. But their routine is suddenly disrupted when Kenji announces he's coming home to visit during his school break. While they're happy to see him, his presence throws their intimate life into chaos, making it impossible to indulge freely. Tooru, in particular, finds himself in a late-life arousal phase and can't suppress his urges. Attempts to get Kenji out of the house fail as he lazily lounges around. Finally giving in to desire, Tooru convinces Honami to sneak away with him to a love hotel.