There may not be a widely known 'eternally regressing knight novel' by that exact name. However, if we look at some more complex and less mainstream fantasy works, we might find stories that touch on this concept. Some independent or self - published works could potentially explore the idea of a knight in a state of eternal regression. It could be a niche concept that hasn't been fully explored in mainstream literature yet.
Well, in an 'eternally regressing knight novel', it could imply that the knight is trapped in a cycle. Maybe there's a curse or some sort of magical force that makes him regress. He might be losing his memories or his strength and going back to a less developed state. This would create a lot of internal and external conflict as he tries to break free from this cycle and fulfill his quest.
The concept of eternal regression is a unique feature. It likely means the knight is constantly going back in some way, which can create a very complex and interesting plot.
One similar light novel could be 'Re:Zero − Starting Life in Another World'. It also has elements of a protagonist facing repeated challenges and a complex fantasy world setting. Another one might be 'The Rising of the Shield Hero', which shares the theme of a hero in a difficult situation and has an engaging story.
Anastasia Knight could be a private individual or someone in a specific field like writing or art. Without additional information, it's hard to define who she is exactly. Maybe she is a new emerging talent in a particular creative area.
The Dark Knight was referring to the superhero of the American comic series, DC-Comics. His real name was Bruce Wayne. He was a tall, rich, and handsome man. After witnessing his parents being killed by criminals, he was determined to fight crime with his own strength. Therefore, he put on a batsuit made of high-tech materials and became a batman. He was the Dark Knight of Gotham City, sparing no effort to fight crime and protect the safety of the citizens.
While waiting for the anime, you can also click on the link below to read the classic original work of " Full-time Expert "!
Perhaps the 'knight' is a new character created specifically for this fanfiction. This character could be a symbol of hope and justice, just like Batman, but with a more knightly code of conduct. Their marriage could be a way to introduce a new dynamic to the Batman universe.