Wataru Minakami fails an entrance exam and therefore is left behind by his friends. He suddenly finds out that his father has enrolled him... More >
Wataru Minakami fails an entrance exam and therefore is left behind by his friends. He suddenly finds out that his father has enrolled him in a school in Promised Island and is suddenly whisked there. Upon arrival, he finds out that he has twelve sisters who look forward to spend his time with them. He has to face to a decision to go back to his possibly stereotypical lifestyle in Tokyo or be in Promised Island together with his sisters.

Christmas is here! All sisters have gathered together and want to give their brother an extra-special gift and naturally make the celebration even better than those past. But Wataru has a last-minute agenda to handle. Will he make it back in time?