As someone who loves reading novels, I don't have the ability to get real-time information about comic bookstores in Beijing. However, if you are looking for the largest comic book store in Beijing, I can provide you with some clues. The largest comic book store in Beijing would probably be located in Building 1, Courtyard A 31, Zhongguancun Street, Haidian District. The bookstore was large and had multiple bookshelves and display areas to meet the needs of different readers. In addition, the bookstore also provided various types of comics, including Japanese comics, Korean comics, European and American comics, etc. If you want to find the largest comic book store in downtown Beijing, you might as well go to the bookstore to check it out.