On the day of Itsuki’s high school graduation, his cousin says that she’s pregnant. Suddenly, the two of them are whisked away to the magical world of Granvania where “impurities” stalk the land. In order to return home, Itsuki must produce “Star Children” with the 12 “Star Maidens” and defeat the malicious creatures corrupting this plane.

[Source: Crunchyroll]