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...
When you've finally finished 
Love Rituals with twelve maidens...
...عندما أكملت طقوس الحبّ أخيرًا مع العذراوات الاثنتي عشر
Als du die Liebesrituale mit den
zwölf Priesterinnen beendet hattest,
Por fin terminaste el Ritual de Amor
con las 12 doncellas.
Ya hiciste el Ritual de Amor
con las 12 doncellas.
Alors que tu as enfin fait le rituel
avec les 12 Prêtresses
Ora che hai portato a termine
il Rito d'Amore con tutte e 12 le Sacerdotesse...
Quando terminou o Ritual dos
Amantes com as 12 sacerdotisas,
Ты провёл Любовные ритуалы 
с двенадцатью девами...