Lily Heart, a newlywed married to a man working at a foreign company, met her husband while living in Northern Europe. As they grow accustomed to married life, the couple decides to go on a hot spring getaway. Fascinated by Japanese culture, Lily chooses a traditional inn with mixed-gender bathing, hoping to relax together with her husband. However, her decision leads to unforeseen consequences. While enjoying the secluded hot spring away from city chaos, Lily—wrapped only in a towel—is relaxing alone when local men approach her during her husband's absence, criticizing her bathing etiquette. The atmosphere suddenly turns tense.