This is the Japanese YouTube channel made by KhanAcademy, a non-profit organization that aims to provide a quality education for free to people all over the world via short videos on a range of subjects. Though less well-stocked than the KhanAcademy YouTube channels in some other languages, you can find a selection of videos on math, science, and art. If you're interested in any of these subject areas, this channel is a good way to practice Japanese whilst also learning something else at the same time.
The Japanese is clearly articulated, well-paced, and standard, though the vocabulary is necessarily specialized at times, and the language level advanced. Japanese subtitles are available to help with comprehension and give you some reading practice to boot, and all of the videos are based on the original English versions, so you can always cheat and check out that version if you're having trouble following!