Itsuki finds out that in addition to Stardust Labyrinths where the "Impurity Lords" dwell, there is also the 13th labyrinth, as well as the existence of the 13th maiden. He sets out to find the maiden. However, there is the possibility that the 13th is a male. Although not quite convinced, he seeks all the male candidates he could think of...
That is probably something 
I will never fully understand.
.قد يكون هذا شيئًا قد لا أفهمه أبدًا
Das ist wahrscheinlich eine Sache,
die ich niemals vollständig nachvollziehen kann.
probablemente sea algo
que nunca entenderás del todo.
Probablemente sea algo
que nunca entenderás del todo.
c’est quelque chose
que je ne parviens pas à comprendre.
Probabilmente è qualcosa che
non comprenderò mai appieno.
Isso provavelmente é algo que eu
nunca compreenderei por completo.
И, пожалуй, я никогда не смогу 
понять этого в полной мере.