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.
Why don't you do it?
لماذا لا تفعل ذلك؟
Warum machst du
das dann nicht?
¿Por qué no lo haces?
¿Por qué no lo haces?
Pourquoi ne le faites-vous pas ?
E perché non lo fai?
E por que você não faz isso, então?