Why should this be included in the repository: There is nothing similar on the Software Center afaik.
How many users do you anticipate will use this software: How should I know?
Link to source tarball: https://github.com/kanishka-linux/ReadManga/archive/v2.4.0-1.tar.gz
This application fetches manga images from various sites available on the internet. Therefore, before using this application please check the copyright and licensing laws of your country. Because it's possible that some of these Manga might be already licensed in your country. Therefore use this application at your own risk.
This program gathers manga from sites which have not been granted permission by the copyright holder to distribute the copyrighted material. Because users in licensed countries would be in violation of distribution rights, this software is ineligible for inclusion.