Mamoru is a university undergrad who, being a hikikomori, doesn’t go to school unless absolutely necessary. One day in May, he was lectured by a prof due to his lousy attendance. He went to the roof for a breath of fresh air and while he was sitting on the bench and looking at the sky… a hole opened up in the sky! Out comes a lion princess, followed soon after by her brother and sister.

[From Hau~ Omochikaeri!]