I guess youu have to be japanese to get the joke

Seriously I just stumbeled upon these crazy pictures and I totaly don't get it at all.

This looks like some kind of JonesTown mass suicide shit or maybe its just asian kids fuckin with their teachers.
sadly the website is all in language i can't read so what ever.
have fun asian school kids doing things I will never understand.
http://pann.nate.com/b229415