まんが王国ビューア is the official viewer app for "まんが王国" (Manga Kingdom). This app offers a wide range of features that make reading comics more enjoyable than viewing them on the web.

For registered members, the app allows you to display your own bookshelf, giving you easy access to your favorite manga titles. Simply launch the app from the "まんが王国" website to view your bookshelf.

One of the great advantages of this app is the ability to read purchased manga even when offline. You can download the manga data from your bookshelf to your device, allowing you to enjoy your favorite titles even without an internet connection.

Additionally, the app provides introductions to various manga titles, offering free samples for readers to enjoy. With over 2,200 titles available, including large-volume samples of up to 3 volumes for free, there is plenty to explore.

Please note that the app is compatible with Android devices running version 5.0 or higher. It is not supported on devices such as BlackBerry or Windows Phone, as well as older Android devices (feature phones) that do not run on the Android OS.