Indescribable, but Recorded in the History of the Kingdom

Lorne Gray, the trainee editor of the Kingdom History Museum, received a disaster report: Gray Moss Town in the north was burned down by a black dragon. But when he was transcribing the place name as usual, the three words "Hui Moss Town" disappeared from the paper. To make matters worse, the mentor's name is being erased from files, personnel books, and everyone's memory. The Inquisition wants to declare this matter a heresy, the Knights insist that the black dragon really exists, and the Kingdom just wants to file it within three days as soon as possible. The only thing Lorne can rely on is a quill pen, an old untitled book, and the archival regulations that historians must abide by. He thought he was tracking down a fake dragon plague. It was later discovered that the so-called black dragon may be the only reason for the survival of Gray Moss Town.