The Headless Horseman Chronicles 07 did not appear in the official volume of the novel, but it was an independent derivative work that was not directly related to the original novel. Therefore, there was no corresponding chapter in the novel for the Headless Horseman 07.
The fifth volume of the Headless Horseman animation had been released.
The thirteenth volume of the Headless Horseman novel was not an episode in the anime. The Chronicles of the Headless Horseman was a Japanese light novel. The thirteenth volume of the novel had not been adapted into an anime.
In the story, the headless horseman is often described as a Hessian soldier. He was a mercenary fighting in the American Revolutionary War. After losing his head in battle, he is doomed to ride eternally in search of his lost head.
I can't answer which volume of the novel the Headless Horseman is because I don't know what the content of this animation is. I can only provide information related to the novel.
The fourth volume of the Headless Horseman novel was equivalent to the first episode of the anime.
The second season of the Headless Horseman story took place after the third volume of the novel.
" Chronicles of the Headless Horseman " was a Japanese light novel written by Kazuma Kamaike and illustrated by Hololive. The novel was released in May 2012. The story was about the protagonist, Aoba Raishi, who was an ordinary high school student but lost his head in an accident. After that, he began his journey to another world. During his journey, he met all kinds of people and gradually discovered his special abilities. The story involved many elements related to the culture of the foreign world, myths and legends, and historical events. It also involved human nature, friendship, love, and other topics. The novel was very popular with readers and won many awards.
I am unable to provide a link to the tenth volume of the novel, Chronicles of the Headless Horseman. Because the novel " Chronicles of the Headless Horseman " was a Japanese light novel, the copyright belonged to a Japanese publishing house or animation production company, so the novel could only be read in Japan. If you are interested in this work, it is recommended to go to Japan's online bookstore or online reading platform to search for and buy it.