Hikaru is a wife who lives happily with her husband and his parents. Her mother-in-law says that she wants to see her grandson's face, but in reality, Hikaru is worried about her inability to be positive about sex. When her girlfriend Hikaru consults her father-in-law, he admonishes her, saying, ``You don't know the joy of sex yet.'' For the sake of her husband and her mother-in-law, Hikaru decides to accept her father-in-law's ``close training'', but...