Prison is a magic swordsman who has forgotten her past and has a dark tendency. She has entered into a life-sharing treaty with a god-like person, but she does not know why. In the constantly disputed magical fantasy world, this mysterious power has become the focus of contention among all parties. And she must ensure her freedom to find her favorite sister, and she must find out who signed the life-sharing treaty with her.
Ai Yi is a ten-year-old girl from the demon fox tribe. Almost all of her tribe is controlled by Thebes, the largest human empire, but this is not what she cares about. She likes Prison from the bottom of her heart, but she doesn't know how to help her. When she knew that her father was killed by the King of Thebes, she wanted to lead Prison out of the dispute, but this was obviously impossible.