Gin Tama (Japanese: 銀魂 Hepburn: Gin Tama, 'Silver Soul') is a Japanese manga written and illustrated by Hideaki Sorachi and serialized, beginning on December 8, 2003, in Shueisha's Weekly Shōnen Jump. Set in Edo which has been conquered by aliens named Amanto, the plot follows life from the point of view of samurai Gintoki Sakata, who works as a freelancer alongside his friends Shinpachi Shimura and Kagura in order to pay the monthly rent. Sorachi added the science fiction setting to develop characters to his liking after his editor suggested doing a historical series.
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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.