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 the thirteenth labyrinth has 
been sealed all this time.
.أنّ المتاهة الثّالثة عشر كانت مختومة طوال هذا الوقت
dass der 13. Dungeon
que ese laberinto ha estado sellado
todo este tiempo.
que ese laberinto ha estado sellado
todo este tiempo.
mais il paraît que le 13e labyrinthe
était scellé jusqu’à maintenant.
che il tredicesimo Labirinto
è rimasto sigillato fino a ora.
que o 13º labirinto estava
selado esse tempo todo.
что тринадцатый уровень лабиринта 
всё это время был запечатан.