A few days after Kana's death, things seem to be back to normal for Shinichi. Satomi and her friends are perturbed by his seeming indifference, but Shinichi, himself, is grappling with his own sense of disquiet with his unnatural state of mind. Meanwhile, a man begins snooping around about Shinichi...
So some other specific 
change must've occurred.
إذًا لا بدّ وأنّ تغييرًا محدّدًا آخر قد حدث
Es muss also eine spezifische
Veränderung gegeben haben.
Entonces, debió ocurrir algún cambio.
Entonces, ha debido producirse algún cambio.
En fin de compte,
il suit bien une évolution à part…
O que indica que, realmente, 
outra mudança deve ter ocorrido.