"Huh!? What did you just say?" Reiko doubted her ears and asked again. "What do you mean he's still a virgin?" Her son, Naoki, who was supposed to get married, said that he still has no experience with women. "You've had other girlfriends before, haven't you? How can you say you've never done it..." An unexpected coming out. "I thought he was just sighing a lot lately..." Reiko, who was speechless, thought that it was no good to leave things as they were with the wedding just around the corner, and came up with the idea of teaching him sex with her own body...