Husband and wife Tachibana visit a secluded hot spring inn deep in the mountains. The wife, Tsubomi, is in high spirits, enjoying the vacation atmosphere, while her husband Takashi seems dejected. Another couple is also staying at the inn, appearing affectionate and happy as usual. However, their trip is actually a sham—both women are forced to work as sex slaves to repay debts. They perform lewd shows at the inn and provide full-body washing services to guests in the outdoor baths, living each day as obedient sex slaves. How much longer until they realize the inn's true, hidden purpose?