The Strongest Demon Contract

Gabriel wakes up in a strange world with no memory of how he arrived there beyond the vague recollection of falling from a bridge. The first thing he discovers is that something inside him craves the unthinkable: the urge to eat babies. That urge comes from Barth, a mysterious demon bound to his soul through a contract Gabriel doesn't remember making. Childlike, socially oblivious, and unable to recall even his own age, Gabe is captured by members of the Demon Management Society (DMS), an organization dedicated to hunting dangerous demons and containing those who wield them.

Escorted by the cautious Michael and the openly hostile Julie, Gabe learns the terrifying truth about the world. Demons are born from humanity's sins, and when a person forms a contract with one, they gain supernatural abilities at the cost of constantly fighting the demon's temptation. The stronger the sin, the stronger the demon. Gabe's demon—the legendary baby-eating devil—is among the rarest and most dangerous in existence.

Despite fearing him, Michael and Julie begin to see that Gabe is unlike anyone they've encountered before. He doesn't understand the world around him, struggles to grasp basic social conventions, and treats his demon as though it were an ordinary friend. Yet hidden beneath his awkwardness are frightening moments when Barth's influence surfaces, revealing power capable of annihilating groups of enemies in an instant. Gabe's inability to distinguish right from wrong makes him both terrifying and strangely innocent.

As the trio travels away from DMS headquarters, they slowly form an uneasy bond. Gabe's humor and sincerity chip away at Julie's distrust, while Michael begins questioning whether Gabe is truly the monster everyone believes him to be. Along the way, they uncover the truth about demon contracts, witness the devastating consequences of people surrendering to their desires, and encounter a world where every race—humans, elves, orcs, dwarves, and beastfolk—struggles beneath the influence of sin.

If every demon is born from humanity's sins, is it truly possible to resist them—or is every person destined to become the very monster they fear?

Caught between two organizations that each believe they understand what is best for him, Gabe must decide what kind of person he wants to become. But with every temptation he resists, Barth grows stronger... and with every temptation he accepts, Gabe risks losing himself forever.