At a Japanese school, a desperate student council struggles with a recurring problem. The aggressive and relentless members of the Yagyu biker gang stop by the school each semester to beat up the kids, steal their lunch money and vandalize their belongings. The kids want to fight back but realize they're too weak and undermanned against the bikers, and so they hire a handful of tough gals to train and defend them.

Once upon a time, there were two neighboring countries that did not get along. They bickered over trivial things day in and day out. Finally, they went to war over the issue of cleaning up dog feces. God intervened in a hurry and said to the chiefs of the two countries. Country A gives its most beautiful girl to Country B as a bride and Country B gives its wisest young man to Country A as a bridegroom. Then, the princess of country A, Saara, happens to meet a young man from country B...!

Denji is a young man who makes a pact with a demon and ends up working as a Devil Hunter hunting devils.