Blood bond to him.

Bianca Drayce, a 17-year-old young woman, was born without her mother and has been lovingly raised by her devoted father. He's always been a constant source of support and affection in her life. However, what Bianca is unaware of is that her father carries a significant secret about both her mother and herself. Tragically, his health takes a severe turn, compelling her to embark on a desperate mission to save his life. With the assistance of her closest friend Calida and Calida's boyfriend, Bianca decides to summon the mighty demon king, Asmodeus, seeking his aid. In exchange for his help, she is prepared to make a deal. Asmodeus, the supreme ruler of all demons, faces opposition from his cousin, Lucifer, who seeks to dethrone him. Lucifer plans to seize control of hell by assembling an army of lower demons and exploiting others' sins. Upon learning about Bianca's situation, Lucifer cunningly attempts to manipulate her, hoping to turn her against Asmodeus. Will Bianca succumb to Lucifer's deceit and betray her trust, or will her feelings for Asmodeus prove to be a formidable force that shields her from falling into his trap? The fate of hell hangs in the balance as these complex dynamics play out.