Famed Japanese novelist Sato Tsutsomu has penned the story for Triple MonsterS, and you might recognise him as the author for The Irregular at Magic High School. Character designs meanwhile are taken care by Yasuda Suzuhito of DuRaRaRa!! fame.
The plot revolves around magicians in modern society known as Evokers who possess the ability to summon monsters from a different dimension. Evokers are split into three factions, and they all fight for control for the world. To complicate things, six ancient dragons have been awakened to bring about chaos in the realms, and only the best Evokers will only be able to tame and control them.