An incestuous sex movie of Kana Mito and her husband’s step-son named Yuji who attends a private school in Tokyo. He lives alone in the dormitory. During this time Yuji’s father remarried to Kana. He was able to meet Kana once when he returned home. To him, Kana is more like someone he admires than a mother. Then his graduation ceremony came, his father was busy at work so he couldn’t come. Kana didn’t want Yuji to feel lonely, so she went to Tokyo to meet him. And the two went to celebrate Yuji’s graduation. Perhaps because she was too drunk, Kana said all her sincere words. She feels lonely because her husband is always busy with work, that she always has feelings for him. And since then, every time dad is absent, the two are no longer mother and son, but both have become lovers…