Manga Rock users can download manga from more than twenty different sources, and the best part is, you can download several volumes simultaneously and even minimize the downloader while you use your Android device for other tasks.
Of course, Manga Rock is not just for downloading manga, but also for reading it. From the app's reader, you can set options like changing the order or direction (horizontal or vertical) of reading, and adjusting the brightness.
Other options on Manga Rock let you save your favorite collections so that every time there's a new chapter, you'll receive a notification. This means you'll always be up-to-date on your favorite series.
Manga Rock is by far one of the best manga readers you can find on Android. What's more, you can not only read manga online, but also download chapters to read offline, as well.
Requires Android 4.0 or higher