While my girlfriend was away visiting her hometown, I was seduced by her older sister for four days. Riho Matsumoto

The movie revolves around a scenario where the main character is seduced by his girlfriend's older sister while she is away visiting her hometown. The story explores the development of an intimate relationship between the two, navigating themes of temptation, desire, and potentially complicated family dynamics. As the subtitle suggests, the plot unfolds over a period of four days, during which the main character finds himself increasingly involved with his girlfriend's sister.