Action - Adventure - Fantasy - Romance - Harem During high school graduation day, Itsuki Yuge learned that his childhood friend Mahiru was pregnant. Shortly thereafter, Itsuki and Mahiru were thrown into Granvania's magical world which was being attacked by monsters. The person who can fight the monster is "Star Son". However, star children can only be born from 12 Miko from constellations. To defeat the monster and return to his world, Itsuki must be the father of the star children along with the Miko.
