Thanks! I'm not much of a manga/LN reader, so I hadn't actually added that feature for a good bit. If you have any thoughts on how to make the experience better, let me know! I didn't add a "plus" button to increase chapters or volumes, because i'm not really sure how that should be implemented (for instance, katanagatari has 12 volumes and no chapters, while most manga has many chapters and few volumes, and still others have no volumes and some chapters. which values should be increased?)

It says that the app isn't avaible in my country (Italy). Can you release the .apk maybe?