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.
We follow them, to compensate for 
something within us that's lacking.
.نتبعهم، لنعوض شيئًا ناقصًا بداخلنا
Und indem wir diese
Regeln beschützen,
Las seguimos para compensar lo que nos falta.
Las seguimos para compensar lo que nos falta.
Et on les respecte
pour compenser ce manque.
Compensiamo qualcosa proteggendole.
Seguindo-as, tentamos 
compensar o que nos falta.