A reborn woman awakens in a young girl's body within a magical realm, accidentally unleashing the Dark God—an 11-year-old amnesiac trapped in mortal form. Her survival hinges on a dangerous scheme: making him believe she is his cherished older sister. Traversing treacherous realms with a spirit beast that devours her troubles and evading a relentless seer after her mystical companion, she fights for safety and power. The Dark God searches endlessly for one thing—his stolen heart. A riveting tale of transmigration, reincarnation, and the high price of taming a god.