From the campaign:
Enter a world ruled by Monsters, where humans have been driven to the brink of extinction, and all that remains of a once great empire are ruins and memories. MajiMonster is the name given to the creation of ancient maji—sorcerers of old. These creatures are the result of magics infused with common beasts or inanimate objects, and with their power they have escaped the control of the maji that created them.
Take on the role of a binder, a unique person that can capture Monsters and direct them as both weapons and companions. Explore a savage landscape and encounter a variety of Monsters with combinations of 10 affinities such as Fire, Mystic, or Wind.
Choose from one of six unique binder classes, each of which uses different approaches to binding, fighting, and training the Monsters of this world. Will you be a gallant knight, forged in battle? Were you born a concordant, infused with magic? Perhaps your role is that of a scholar, to teach the world the knowledge it has lost.
Binders roam the land for their own reasons—to make a name for themselves, seek out ancient treasures, or, possibly, just to find a way to survive this harsh world.