My mother and I had intercourse during pregnancy. When we realized it was different from having sex with another person, we became wildly obsessed with the pleasure of reproduction. (Tomoda Maki ROE-123)

Maki raised her son Kosuke single-handedly. As he grew up, she decided to remarry her current boyfriend, but recently she began to have strange feelings for Kosuke. One day, she received a letter from the hospital where Kosuke was born, in which she said that Kosuke was not her child. Kosuke had always had feelings for his mother since he was a child. Upon learning that he was not his mother's child, he hugged Maki and cried uncontrollably.