Ruin, an adventurer with the Monster Tamer job, was banished from the Hero party, branded as incompetent. His contributions as the strategist, the unseen force behind their success, went unnoticed…
However, the moment he discovered Sasha, the Demon King of Death, one of the seven sealed Demon Kings, he awakened as a Demon King Tamer, possessing the power to command Demon Kings! Furthermore, upon breaking the seal, he simultaneously tamed Demon King Sasha—
With Sasha as his companion, and successfully drawing out her power, Ruin sets out to subjugate all the Demon Kings, the root cause of the conflict between humans and Demons.
An overwhelming, unrivaled fantasy, led by a boy who reigns over Demon Kings, begins!!
