Yes, it is allowed to write a sequel to a famous book as long as the author of the original book gives permission or the book is in the public domain. If the original book is still under copyright, the author or their estate would need to grant permission for a sequel to be written. However, it is important for the sequel to be respectful of the original work and to not infringe on any copyright or intellectual property rights. **

A sequel is a work of literature, film, or other creative work that continues the story or expands upon the original work. It typically follows the events of the original work and features the same characters or settings. Sequels are often created to capitalize on the success of the original work and to further develop the storyline or characters. **

Yes, Tokyo Ghoul:re is a sequel to the original Tokyo Ghoul series. It continues the story of Ken Kaneki and introduces new characters and plotlines. Tokyo Ghoul:re explores the consequences of the events in the original series and delves deeper into the world of ghouls and investigators. **

As of my last update, there is no official announcement or confirmation of a sequel to the movie "2." However, it is always possible that a sequel could be in development or announced in the future. Fans of the movie will have to stay tuned for any updates or announcements regarding a potential sequel. **

There are several animes that deserve a sequel, but one that stands out is "Noragami." The first two seasons left fans with many unanswered questions and a lot of potential for further development of the story and characters. Another anime that deserves a sequel is "Ouran High School Host Club," as fans have been eagerly waiting for a continuation of the story and the romantic relationships between the characters. Additionally, "Spice and Wolf" is another anime that deserves a sequel, as the original series left fans wanting to see more of the adventures of the main characters. **

One anime that has a sequel is "Attack on Titan." The original series follows the story of Eren Yeager and his friends as they battle against giant humanoid creatures known as Titans. The sequel, titled "Attack on Titan: The Final Season," continues the story as the characters face new challenges and revelations in their fight for survival. Fans of the original series can look forward to seeing how the story unfolds in the sequel. **

Yes, Demon Slayer has a sequel in the form of a movie titled "Demon Slayer: Mugen Train." The movie continues the story of the anime series and follows Tanjiro, Nezuko, and their companions as they embark on a new mission aboard the Mugen Train. The movie has been well-received by fans and critics alike, further expanding the Demon Slayer universe. **

Yes, Black Butler has a sequel titled "Black Butler II." This sequel continues the story of the demon butler Sebastian Michaelis and his young master Ciel Phantomhive. The sequel introduces new characters and delves deeper into the mysteries surrounding Ciel's past and the true nature of Sebastian. Fans of the original series will enjoy the continuation of the story in Black Butler II. **