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.
Do what you want. I don't care what you do!
!افعل ما تريد، لا أهتم بما تفعله
Machen Sie, was Sie wollen.
Haz lo que quieras. ¡No 
me importa lo que hagas!
Haz lo que quieras. ¡No 
me importa lo que hagas!
Faites ce qui vous plaît,
je ne vous connais plus !
Faccia come le pare.
Io non conosco più nessun professore!
Faça o que quiser. 
Não me importo mais com você, Sensei!