I'm a librarian who loves anime, manga, and reading a wide variety of genres.
It appears to be free. The first book is The Three-Body Problem by Cixin Liu, available in EPUB or MOBI formats. I have the EPUB version but it'll be a few hours before I can try it out. I'm still trying to figure out if there's a catch, beyond getting more publisher emails and the program only being available in the US and Canada.