It would be useful to have Fakku books better visually represented depending on whether you own them or not. Currently it is not a big issue since only one or two books are being released at a time, but in the future it could become a minor inconvenience to check each released Fakku books chapter to see if it is part of the book that you purchased. Furthermore, giving a visual distinction to Fakku books that you do not own would visually separate them from Fakku subscription chapters, which is another added convenience.
A possible way to provide a visual distinction would be to have a small red border that goes around the entire entry when you do not own it and would disappear when you purchased the book.