High school student Yuge Itsuki was sent off to a strange parallel world with his childhood friend Konatsuki Mahiru. It was the magical world of "Granvania", which was facing a crisis from the threats of "Impurities." Itsuki was summoned to this world as a "Visitor" to save this world, but to accomplish this mission, he had to perform a ritual known as the "Love Rituals..."
The Impurities of the labyrinth 
have turned into monsters,
،تحوّلت شوائب المتاهة إلى وحوش
Die Befleckungen der Dungeons nehmen die Gestalt
von „Dämonen“ an und sind äußerst gefährlich.
Las impurezas del laberinto
se convirtieron en monstruos
Las impurezas del laberinto
son ahora monstruos
Elles se transforment en monstres,
c’est très dangereux.
Le Impurità che si trovano nel labirinto
si sono tramutate in mostri,
As impurezas no labirinto
se transformam em monstros.
Нечистые из лабиринта 
превратились в монстров