[Machine Translation] Heian Period. How did an ordinary girl named Raven Night, who was picked up by an Onmyoji, become immortal? This is a record of the activities of Tsugaru Shinuchi and his colleagues, "Oni-killers," who hunt monsters in various parts of Japan. The hidden thoughts of Hasei Shizukue, who serves her master in a mansion deep in the mountains. The first case of "Birdcage Master" commissioned by the great man. The heated courtroom drama "The Mermaid Trial" in Scandinavia - the past of the detectives is revealed and the pieces of the story are filled in. A collection of five short stories.