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.
Because there's something lacking in us,
،لأنّ هنالك شيء ناقصٌ فينا
Und dieser Sprung führt dazu,
Ya que nos falta algo, pensamos en 
cosas como la "naturaleza humana"
Ya que nos falta algo, pensamos en 
cosas como la "naturaleza humana"
On a conscience
de ce qu’est l’humanité
Proprio perché ci manca qualcosa siamo
consapevoli della cosiddetta natura umana,
É exatamente por termos algo faltando que 
conseguimos assimilar o que é ser "humano".