Very odd Japanese flag. What the heck is it?

[Uniforms of the Day]

This came from the grandson of the man who owned it. All I know is that the man was in a supply related role, in the Pacific, during WWII. I have never seen anything like this. I can't even state that it is military. If anybody has any clues I would be most grateful. 

It is quality made. Approx. 36" wide.

[Mr. Bushido]

The flag in the picture is upside down.

 

This flag is the "Youth Training School" flag.

The organization conducted military training for young people around 1930.

 

I think you can get reference information by browsing the website below using an English translation service.

 

https://ja.m.wikipedia.org/wiki/青年訓練所

[Salvage Sailor]

Here's a "youth training facility" flag on another site  

 

...and another flag

 

[Uniforms of the Day]

This should be right side up

[Uniforms of the Day]

Thanks. You guys were right on. It is for the Yamasa Youth Training Center. Apparently, Yamasa, a large soy sauce company in Japan, established their own training center. Pre-military age employees could attend the training before or after work.