Tales of a Reincarnated in TDG

Synopsis: A young man from the modern world happened to find a book titled - Demon Devouring the World - in an old box in his rented house. Without thinking too much, he picked it up to take a look, thinking it was a fantasy book like the ones he was used to reading in his spare time. However, as he opened the book, an extremely sharp page cut his finger causing his blood to touch the book in his hand. When this happened, a red glow lit up from the first page in the book causing the young man to close his eyes at first. However, when he opened his eyes again, the book was no longer in his hands, and he was also no longer in his house, all he saw was a dark cave full of bones and pieces of cloth torn on the floor!