In 1990s Japan, Ren is a deadly assassin bound by blood to the Syndicate, an underground empire where loyalty is currency and survival is brutal. Haunted by amnesia and a fractured past, Ren moves through a shadowed world of violence, where every kill could be his last. But when a mysterious masked enemy known only as “Y” emerges—wielding forbidden assassination techniques that defy the rules of the underworld—Ren’s carefully controlled existence shatters. Forced to face long-buried truths and question who he really is, Ren must navigate a dangerous game of power, betrayal, and revenge. In a world where memories vanish and trust is deadly, the rule is clear: kill first… or be forgotten forever.