Shouji was born poor with the rare gifts of a yuusha, yet he wastes them drowning in intoxication and drugs. He survives through violence alone, until he encounters an extraordinarily talented young alchemist trapped in crippling debt. Her potions possess unmatched purity and potency—invaluable commodities in the right hands. Abandoning all pretense of honor and heroism, Shouji sees the opportunity clearly: the lucrative criminal underworld. He assembles a ruthless gang around her remarkable formulations, transforming her creations into an empire of organized crime. Together with his alchemist partner, he navigates shadowy dungeons and faces monsters both supernatural and human. His potions become the currency of power in the demi-world's dark markets. The fallen yuusha has become something far more dangerous than any demon—a ruthless criminal mastermind consumed by wealth and power. No longer bound by destiny or virtue, he challenges the very darkness he now commands, forever transformed from hero to villain.