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.
So you're saying that love and ethics 
are just worthless rules?
إذًا هل تقول أنّ الحب والأخلاق قوانين عديمة القيمة؟
Wollen Sie etwa sagen,
¿Dices que el amor y la ética 
no son más que reglas sin valor?
¿Dices que el amor y la ética 
no son más que reglas sin valor?
Vous pensez que l’amour ou la morale
ne sont que des règles sans valeur ?
Sta dicendo che amore e morale
sono regole prive di valore?
Você está dizendo, então, que o amor e a
 ética são apenas regras sem valor algum?