With her husband and son who had just started working, Sayaka lived a happy yet ordinary life with the three of them. Meanwhile, Toyama, who was close to Sayaka's son during their student days, had feelings for Sayaka, his friend's mother. As job hunting began and days passed without seeing each other, his feelings did not fade but instead turned into a twisted obsession. Yasuyama decided to make Ayaharu his own and visited her. Without any warning, Ayaharu's peaceful daily life came to an end.
