Here is an adorable, delightful, fun and interesting series on YouTube in Japanese about astronomy. The narrator is very pleasant to listen to, and the music is soothing.

太陽系の旅　第１回:

Nice find!

Here's a good channel full of science content:
https://www.youtube.com/user/jstsciencechannel

I'm almost positive that the video you linked originally came from this organization (because of the watermark in the top right), but I can't find it on their channel or any reference to it on their site, so who knows...

Anyway, cool video, thanks for sharing!