In order to seek revenge for his father's death, Tategami Seigi enrolls in a school in Hokkaido called "Zoo". A place where the toughest delinquents gather. Who is Seigi's fiancee, Yoko Shiratori, really...

After the meteorite "Artemis" collapses on the moon, an unidentified phenomenon affects humans: the "Reproductive system disease". 12 years passed and mankind has done research in the field of cloning and...