Time has passed since the incident at Magata Labs, and Saikawa and Nishinosono's daily life is returning.  Then one day, Shiki visits Saikawa at the university library..
I don't know.
.لا أعلم
Hm, gute Frage.
Pues no lo sé.
Pues no lo sé.
Aucune idée, à vrai dire.
Già, chissà...
Não sei. 
Por que será?