Transmigration in a book is a popular genre that has been on rising in recent years. As a certain otaku, Kurosawa Masao is one of those someone who has entertained those thoughts in his daydreams but never wanted it. He was comfortable in his life of being a salted fish. Until one day, he found himself waking up in a body, not of his own, and was transported to one of his favorite stories. The body wasn't the protagonist, the villain, or the sidekick. It wasn't the cliche cannon fodder or mob character either. Instead, he was a background character in the story who was just mentioned. It looks like a blessing not being entangled with the main plot. It was a dream come true to have been given the role of a background character who didn't even appear in the story. Unfortunately, he was given the role of a background character who died before the main plot started. Louis Noir Ignotus Arkavelnias - The 13th child of the main villain of the story. Died for mysterious reasons- Ahem, was probably killed by one of his siblings for the right to inherit the throne. This isn't his dream life and he wanted to live quietly as possible and survive. But it was impossible, even without the main plot and the protagonist, he was entangled with the Main Villain and the villainous half-siblings. As a dead background character, he would strive to change his fate and get away from the schemings and conspiracies.