• the devotion of suspect x:

Yasuko Hanaoka, a divorced, single mother, thought she had finally escaped her abusive ex-husband Togashi. When he shows up one day, threatening both her and her daughter, the situation quickly escalates into violence and Togashi ends up dead on her apartment floor. Overhearing the commotion, Yasuko's neighbor, mathematics teacher Ishigami, offers his help, disposing not only of the body but plotting the cover-up step-by-step