In the process of investigating Director Shindou's murder, Nishinosono and Saikawa learn the details of Shiki's multiple personalities and the murder of her parents that took place 15 years ago. The two of them try to figure out what she was thinking in order to find a clue.  In doing so, Nishinosono is forced to confront her own past.
Evidently, Sasaki Suma was 
based on Morikawa Suma,
،من الواضح أنّ ساساكي سوما كانت مقتبسة من شخصية موريكاوا سوما
Sasaki Suma basiert auf
Suma Sasaki viene de Suma Morikawa, quien 
fue su sirvienta cuando estuvo en Estados Unidos.
Suma Sasaki viene de Suma Morikawa, quien 
fue su sirvienta cuando estuvo en Estados Unidos.
Suma Sasaki serait inspirée
Sasaki Suma, pare, è stata modellata
sulla domestica che la aiutava
A Sasaki Suma-san
 foi uma identidade baseada