It is an application that manages books such as paperbacks and manga. The feature is that it is easy to find unlimited folders that were unlikely and books that you do not have. This app is the only one that has 5 ways to register books! !! It's simple but has a lot of functions and is intuitive to use. The operation is crisp and the troublesome input is minimal. You can also memorize memos and see purchase / reading results in a graph. When I start searching the web for the next book to read,