After returning from the summer festival, the girlfriend, her boyfriend, and their male friend decide to drink again and start drinking in a room. As the drunkenness spreads and the meter rises, they start asking questions like, "Is she really not wearing a bra under her yukata?" or "Are she not wearing any underwear under her kimono?" and in their drunken state, dirty jokes fly around. Thanks to the friend's trickery, the boyfriend gets drunk and falls asleep, and only the girlfriend, the guy, and the friend are awake. The free-for-all after the festival begins...