"I don't have this barcode!" Some manga and books that have lost their covers do not have barcodes. Have you ever tried to register a book in an app that can manage your collection? ISBN is a 13-digit number, so you can enter it. That's true, but it's hard to enter many books. In such a case, this app! !! You don't even have to look for ISBN characters. If there are ISBN characters somewhere, such as the back cover of a book or the last page, you can scan the entire page. After that, the app