Wife Hitomi is enjoying a solo trip while her husband is busy with work. Today's destination is a renowned hot spring inn famous for its outdoor baths. Nestled by a quiet riverside, it's a historic, long-established establishment. Working at this inn is Hitomi's former university wrestling club senior, someone she once dated. While she usually indulges in affairs at love hotels, today she's changed things up—visiting the inn under the guise of a trip to see him. Of course, her real intention is sex. Arriving at the inn alongside other married women proudly flaunting their big tits, Hitomi checks in with a suspicious, mischievous smile. Soon, these women begin outrageous acts, plunging the inn into utter chaos.