This is the story about Jill(景俄), where she is tho only daughter of Hell Governor, Luzeus V, and an angel with tail, Azazel. Jill got the command of her hell father when she was 17, during her normal school days. 2 mysterious human looked creatures appeared and changed her life entirely by giving her to live for the last 12 hours of her life. In the last 12 hours, Jill knew what is the most important and meanningful thing in her life. She suffered a lot in that period of time, due to heavy shift in her soul. With the help of the 2 mysterious creatures, the lives of her family members were safe. Jill discovered the conspiracy of the attack of demons on her during coma. She knew that no one can help to protect everything that mean to her, not even her hell father or her angel mother, but herself. Hence, she stepped on a journey of no return, by sacrifice herself to fight for what really mean to her.