Orphan Ruby has a tragic fate. Abused by her foster father, Marquis of Lan Cheng, she is the daughter of Demon Lord Jett of The Sheridan Family. Her eldest uncle, Felix Sheridan, rescues Ruby. She begins a journey of finding family and vanquishing monsters. Ruby faces dangers, using her talents to turn peril into safety. Ultimately, Ruby reunites with her father, Jett, and mother, Celeste Sheridan. The family resolves crises.