The Duke University library offers many East-Asia resources for K-12 teachers and students. The library portal has links to hundreds of specialized websites covering East Asia, with a special emphasis on China, Japan, and Korea.
The site is very well organized and has a lot of fun information  
Home start page.  https://guides.library.duke.edu/K-12resourcesonEA
 
This is a great starting point to explore topics from anime to martial arts, visual arts, etc.