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.
Then what if they were in that room before 
the security cameras were installed?
إذًا ماذا إن كانوا بداخل الغرفة قبل تركيب كاميرات المراقبة؟
¿Y si entró al cuarto antes de que 
instalaran las cámaras de vigilancia?
¿Y si entró a la habitación antes de que 
instalaran las cámaras de vigilancia?
Et s’il se trouvait déjà là
avant l’installation des caméras ?
E se... Ele já estava naquele quarto