Doraemon (Japanese: ドラえもん) is a Japanese manga series written and illustrated by Fujiko F. Fujio, the pen name of the duo Hiroshi Fujimoto and Motoo Abiko. The series has also been adapted into a successful anime series and media franchise. The story revolves around a robotic cat named Doraemon, who travels back in time from the 21st century to aid a boy named Nobita Nobi (野比のび太 Nobi Nobita). The Doraemon manga series was first published in December 1969 in six different magazines.A total of 1,345 stories were created in the original series, which are published by Shogakukan.It is one of the best-selling manga in the world, having sold over 100 million copies as of 2015.
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To install apps that are not from the Google Play Store; Android requires you to enable the (Unknown Sources Setting).
To enable the Unknown Sources setting:
Go to your Home screen and tap Settings. Select Security. You may need to scroll down to see the Unknown Sources setting, enable this setting then try installing the application again. For Android 8.0+, tap Settings, then tap Apps. Next search for the app you just downloaded and enable it to be installed. If you still have problems try searching online for how to turn on >>> (Enable Unknown Sources) for Android.