Revised
This is a Live Wallpaper app of "The Bears' School". Set this app as home screen, and
you can switch wallpaper by double tapping the home screen.
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This is an official "The Bears' School" app.
https://twitter.com/the_bearsschool/status/996631432071073793
https://www.facebook.com/kumanogakkou/photos/a.597771263604260.1073741828.497116500336404/1725680630813312/
