There are many kinds of notebooks, but basically they can be divided into original ones and fans. As the name implies, fans are fan works derived from the world outlook and characters of anime, light novels and comics. As the mainstream of notebook industry, this field has been named "the king of notebooks" one after another. At first, Asuka, then Sento Isuzu, and the new "King of Books" Athina. These works are widely active in the otaku circle and have become spiritual food for countless otaku. This kind of book has a very strong fan base, as long as the painting is not too bad, the sales volume can still be guaranteed.