In a world of magic and ancient evils, a young man known only as 'Number 53' endures a hellish existence as a test subject in a clandestine magical development facility. Tortured and experimented upon, his only companions are the pain and the terrifying beast sealed within him. But when a new, familiar face arrives, forgotten memories resurface, igniting a burning desire for revenge and a desperate fight for freedom. Can he harness the raw power of a Tailed Beast to shatter the chains of his torment and forge a new destiny in the magical world of Fairy Tail?