Solaya lost part of her memory while lying in a mental hospital, both in the world and in the devil's world. She stopped having nightmares after receiving treatment at the age of five. Unexpectedly, she relapsed eleven years later, and she was actually separated from the old woman in the clothing store who had been treating her in the nightmare. When she woke up, she found that she had been in the mental hospital all the time. Only a little fox in the dream was both real and illusory, and actually saved her. From then on, she entered the thrilling devil's land and embarked on a journey of adventure and finding the truth...