Itsuki Yin is an ordinary high school girl, but she also has another identity, she is the slayer of a family of slayers! A mysterious mission caught her off guard and made her aware of various emotions in the world. A mysterious mirror allowed her to see her past life. What surprised her was that she turned out to be the daughter of Emperor Huantian. What surprised her even more was that her lover in her previous life was actually him? ! Are you kidding me? !