There is a human-like species among humans called "Foreign Spirit People". This is a type of human being who is associated with the mysterious power of the universe. However, what is truly associated with the universe is not themselves, but an existence called "Puppet Spirit Body". The just party is the "puppet spirit", and the unjust party is the "yuan spirit". They coexist in a higher species like human beings, and they conflict with each other because of their competition for interests.
Although the heroine in the story appears as a supernatural being at the beginning of the story, she was not actually a supernatural being at the beginning, that is, when she was born. Instead, her twin sister, who has never appeared in the story, is a supernatural being. This has to mention the character of the heroine: indifferent, numb, ignoring everything, killing one person after another but having no emotions, and it is even impossible to tell from the outside whether there is such a thing as emotion in her heart. However, it turns out that her heart will be closed to the outside world. Only because she has been hurt inside, in order to protect herself, she will pretend to ignore the feelings of others, and turn it into her own fragile strength. Hoshino Yanling is actually a child who lacks love. She is just a child, but she has to bear too much and has to have chaotic thoughts. Until the moment she stabbed the fruit knife into her sister's heart, the silent tears in her sister, Hoshino Qika's eyes, still could not bring her heart back. And the source of her injury was the person she loved most...