Summary
Although Misako has been married to Yosuke Amamiya for a year, her new stepson Kazuhiko has not yet shown any recognition or regard her as a mother figure. However, she is preoccupied with a more urgent concern: when she is alone at home, she often receives threatening phone calls from an unfamiliar person who has extensive information of her daily activities. Incapable of broaching this matter with Yosuke, she chooses to remain mute on these unsettling exchanges.
Just as Kazuhiko begins to develop a positive relationship with Misako, the situation takes a more sinister twist when she receives a sexual object delivered to her doorstep. Deprived of satisfaction by her husband’s excessive work schedule, she starts a new activity: engaging in masturbation while on the phone with an unidentified speaker. After observing Kazuhiko engaging in self-pleasure with her undergarments, Misako comes to the realization that she is not the sole individual harboring a sinister secret. Having established that her stepson perceives her as a woman, what is the future trajectory of this sexual tension?