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'm sure there's no reason.
.أنا متأكد أنّ ليس هناك سبب
Bestimmt einfach nur so.
Dudo que tuviera algún motivo.
Dudo que tuviera algún motivo.
Je ne pense pas
qu’il y ait de raison.
Non credo proprio ci sia un significato.
Não deve ter nenhum
 motivo especial.