Mother and son cross the forbidden threshold, secretly craving each other's bodies in a place unknown to anyone else. Burdened with the debt left behind by her husband, Megumi struggles to make ends meet, working tirelessly every day. Her son, Hiroaki, also works desperately for his mother's sake, and the two escape their mounting stress over repayment by going on a trip together. At their destination, they forget the pain of reality and hungrily indulge in each other's bodies. Their bond deepens amid the crushing pressure of debt and loneliness. Escaping the noise of daily life, a new emotion begins to blossom between them as they lose themselves in a world of just the two of them.