SilverWook said:
There's a Japanese LD of the animated Flash Gordon movie?
Yep.
http://en.wikipedia.org/wiki/Flash_Gordon#Flash_Gordon:_The_Greatest_Adventure_of_All_.281982.29
The only known commercial releases were by VAP Video in Japan (catalog #67019-128), c. 1983, in both laser disc and NTSC VHS videotape formats and in Bulgaria, where it was released on VHS "Van Chris" and "Drakar".