There is actually a giant underground colosseum hidden at the bottom of the Giant Nest Gym in Dogtooth City, where brutal unrestricted dog fights are staged every day. According to legend, only those who have received invitations can enter, and the dog owners who win the competition can receive generous bonuses. The protagonist Daimendai was a circus animal trainer who incurred huge debts due to his addiction to pinball machines. Later, he got an invitation to the Colosseum through his connections, and took his dog and former performance partner "Luthor" to join the underground fighting. But the sight he saw was simply beyond biological explanation. This... Was this really a dog?
