异能少女叶洛意外与九王爷沧澜夜绑定契约，拥有了强行召唤出九王爷的能力，也发现这个位高权重的神秘九王爷竟然拥有人形与半妖两种形态。叶洛与沧澜夜围绕着契约斗智斗勇，也在结盟过程中逐渐相知相爱，然而沧澜夜为了不让半妖力量因契约而失控，决定远离叶洛，压制失控力量，二人的关系也迎来新的危机。

The supernatural girl Ye Luo accidentally bound a contract with the ninth lord Cang Lan Ye, possessing the ability to forcibly summon the ninth lord, and discovered that this powerful and mysterious ninth lord actually has two forms: humanoid and half-demon. Ye Luo and Cang Lan Ye fought their wits and courage around the contract, and gradually got to know and fell in love with each other in the process of forming an alliance. However, Cang Lan Ye decided to stay away from Ye Luo in order to prevent the half-demon force from getting out of control due to the contract, suppressing the out-of-control force. The relationship between the two also ushered in a new crisis.