"It'll be over in just one hour..." Instead of a motel, a weekly karaoke rendezvous is arranged with her son's younger tutor, a carnivorous mother who doesn't sing but only releases her lust. In the riding position, with each thrust, white foam of her lewd love juices rises. (Aozora Hikaru START-599)

Hikaru becomes close to a younger male teacher who works as a tutor for only children at a parent-teacher conference. Under the guise of consultation, they develop a relationship involving frequent private conversations. Soon after, the two begin meeting secretly at a karaoke bar, eventually leading to a physical relationship. The man, who initially managed to remain rational, is unable to resist Hikaru's indulgence and aggressive advances, gradually becoming addicted to the sexual aspects of this illicit affair.