Hikaru is a wife who lives happily with her husband and his parents. Her mother-in-law says she wants to see her grandchild's face, but in fact Hikaru is worried that she can't be positive about sex. When Hikaru consults her father-in-law, he tells her, "You don't know the joy of sex yet." For her husband and her mother-in-law, Hikaru decides to accept her father-in-law's "close-contact training," but...