A married woman named Ai struggles with her husband's dedication to work instead of their family life after two years of marriage. Her husband's boss, Koji, notices their situation and suggests a couples trip to a hot spring resort. However, on the day of the trip, Ai's husband declines due to work obligations, leaving just Ai and Koji to embark on the journey together. Feeling lonely at the inn, Ai turns to alcohol at the attached bar where she meets Koji again. Overcome by emotion and loneliness, she clings onto him and asks for physical comfort. Although surprised, Koji accepts her advances and they indulge in passionate, intimate intercourse despite being married to other people...