Mana, the protector fairy for Visitor Itsuki, plans the "Ultimate Love Ritual" to encourage maidens who have yet to perform "Love Rituals." It is supposedly an ultimate heavenly experience, but only a single maiden who managed to catch Itsuki's heart can be his partner.
In other words, the Impurities will be 
revived again unless we seal it.
.بعبارة أخرى، ستُحيا الشوائب مجدّدًا ما لم نختمها
Solange wir es also nicht versiegeln,
O sea, que revivirán una y otra vez
si no lo sellamos.
O sea, que revivirán una y otra vez
si no lo sellamos.
Donc si on ne le scelle pas,
In parole povere, se non lo sigilliamo,
le Impurità si ridesteranno!
Ou seja, se não selá-lo,
as Impurezas voltarão!
То есть пока мы его не победим, 
Нечистые будут появляться снова и снова.