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..."
In this world, every ten years, Visitors with
في هذا العالم، يظهر كلّ عشر سنوات ضيوف
como Visitantes que vienen del cielo
como Visitantes que vienen del cielo
São Seres Divinos.
В нашем мире каждые десять лет 
с неба являются