Three married women, each married to a bank employee, live together in the same company housing apartment complex. Among them are Maki, the branch manager's wife; Reiko, the loan department chief's wife; and Aki, a young wife who recently joined the women's association. The group plans a joint two-night, three-day hot spring trip alongside their husbands' business hospitality tour. However, this trip hides a secret agenda. Maki and Reiko, a lesbian couple, have been secretly involved and now intend to carry out a special plan at a hot spring inn—completely excluding men. Their hidden intentions will finally be revealed by the end of this journey.