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..."
and stuff about missions, 
it's all kind of sudden.
...والمهام وما إلى ذلك
.كلّ هذا مفاجئ
ou accomplir notre destinée
du jour au lendemain…
и всякие миссии... Всё так внезапно.