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...
Now, you can love the thirteenth 
maiden with fresh feelings.
.والآن، يمكنك أن تحبّ العذراء الثّالثة عشر بمشاعر منتعشة
Jetzt kannst du der 13. Priesterin deine
frischen Liebesgefühle übermitteln.
Ahora puedes amar a la decimotercera
doncella con sentimientos frescos.
Ahora amarás a la decimotercera
doncella con sentimientos frescos.
Tu peux désormais aimer les Prêtresses
avec des sentiments renouvelés.
Ora potrai amare la tredicesima Sacerdotessa
con rinnovato sentimento!
Com isso, você pode amar a 13ª
sacerdotisa com novos sentimentos.
Теперь ты с новой силой сможешь 
полюбить тринадцатую деву.