In a world decades into the future, the knowledge and materials brought back by the numerous individuals returning from being summoned to other worlds have caused numerous changes in the workings of the world. Among other things, magic has become common place and the most popular sports are the various events that take -place in the Arenas, which include games like capture the flag to straight up head-to-head combat. Follow our protagonist, a young girl who may or may not have a few screws loose, as she meets an assortment of character and grows with each experience.