Mina, a housewife living happily with her husband and father-in-law, has a secret. Hidden from her husband, Mina has feelings for her father-in-law, and while she cares for him, she also provides him with "sexual care." However, one day, when Mina's father-in-law is injured while she is away, her husband decides to have him admitted to a facility on short notice. The two have four days left until he can move in. Mina and her father-in-law's actions cross the line, and the relationship develops into a passionate relationship of lovers, where they passionately desire each other...