What is a top secret file?Top-secret files are secrets that should never be revealed. They should have been put into coffins with those who kept them, buried deep in the ground, and never seen the light of day.However, due to certain needs, they were left in this world. The few people who have come into contact with the top-secret files will be deeply shocked by the contents. These people are ordered to "seal" and not confide a word to the outside world. In this country, there is nothing more mysterious than the mysterious cases involving the police. These cases are kept secret, either because they are weird, or because they are bloody, or because they involve too much complicated privacy. In the "top secret files" of the police.

These top-secret files cannot be made public, but when the validity period of confidentiality expires, even top-secret files must be made public. As time went by, batch after batch of documents classified as top-secret files were unsealed, and their contents gradually surfaced. Among these documents, there is a very special one: This document is different from other documents that are printed on government official paper. Instead, it is recorded in a black-bound notebook, and its contents are entirely handwritten.And the person who wrote it stated at the beginning that all the people involved in this article were replaced with pseudonyms, so as to avoid the dilemma of their privacy being made public on the day when the top-secret files are released.

Even so, the handwritten document has drawn a lot of attention.Not only because of the mysterious anonymous person who wrote it, but also because the content recorded in it is so horrifying that it can be described as "horrifying". Therefore, those who have read it all call it the "Black Paper Document", or "The Fog of the Shura Field".