Light novels were literary works that were mainly targeted at teenagers and were featured by lightness, humor, and romance. As the audience of light novels was relatively young, the copyright owners and publishing houses had relatively low awareness of copyright protection. In addition, light novels often needed to be adapted into animations, comics, games, and other forms. Therefore, the transfer of copyrights also needed to be coordinated and approved by many parties. For various reasons, some publishing houses or copyright owners might choose to remove light novels from the shelves. It might be because the copyright expired, they could not obtain the support of the copyright owner, and they needed to transfer the copyright. In addition, some unscrupulous websites may steal or spread the content of light novels that are not authorized by the copyright owner, which may also cause some light novels to be removed from the shelves. There could be many reasons for the removal of light novels, and copyright protection might be one of the important reasons.