Yes, I know some Angel Beats Doujin novels. Angel Beats was a very popular Japanese light novel. The storyline was different from the original, and there were often various re-creations. Some of Angel Beats 'doujinshi novels may include different characters, reconstructed plots and worldviews, as well as different storylines such as love, adventure, fantasy, etc. These novels were usually written by different authors and used different styles and styles. Some of the famous doujinshi novels include Angel Beats in Heaven and Angel Beats! "Angel Beats of the Lost Souls" and so on. These novels had a wide readership and were often regarded as derivative works of the original work because they usually had higher storylines and character descriptions.