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.
I had the same initial idea.
.راودتني نفس الفكرة في البداية
Das habe ich am Anfang
auch gedacht.
Fue lo primero que se me ocurrió.
Fue lo primero que se me ocurrió.
Moi aussi,
j’y pense depuis le début.
Anch'io l'avevo pensato inizialmente.
Eu também pensei nessa 
possibilidade, no começo.