Eighteen years ago, there was a catastrophe on the earth. As a result, the human world is destroyed by non-human beings, and cases occur frequently. Later, humans discovered that these aliens came from the world of fairy tales. Therefore, people sent these wanderers to live in "Fairy Tale Town", and the department that handled cases related to Fairy Tale Town was called "Fairy Tale Island". Eighteen years later, young Ye Tong asked to be transferred to "Fairy Tale Island" to work in an attempt to investigate a forgotten case. Now Xia Hanyun, the person in charge of "Fairy Tale Island", seems to have his own story.
Purpose: Redeem each other while exploring the truth. Light detective, the interaction between the fairy tale world and the real world.