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 think that is a purer state of humanity.
.أعتقد أنّ تلك حالة بشرية أنقى
Das halte ich für das reine Wesen
eines Menschen.
Creo que es el estado de humanidad más puro.
Creo que es el estado de humanidad más puro.
Voilà ce que j’appelle
un être humain pur.
Per me è così che 
dovrebbe essere una persona pura.
Eu acredito que essa é a forma
 mais pura de um ser humano.