The story is set mainly in a world other than our own. Ginta, the main character, is a dreamy, less-than-average, Japanese schoolboy who is summoned into the world of his dreams, to fight an evil organisation and save a princess. The storyline is rather typical. The main character is called to be a hero and must save the world from evil. What is unique, however, is the fighting style. In the world of MAR Heaven, people fight using ARMS: jewelery that can be transformed into swords, spears, or even guardian monsters. 75% of the manga is staged within a tournament between the evil organisation, the "Chessno Koma", and Ginta's resistance troupe. Ginta and his friends have to battle one-on-one with their enemies to advance in a "war game" and gain a chance to fight and defeat the "king" and "queen" of the Chess. This, rather than the story, is the lure of this manga.

If you like elaborate and exciting fight scenes, I highly recommend this manga for you.