This is a long-seller Japanese wheat snack, prawn flavor, "Kappa ebisen".
It has been put on market since 1964 by Calbee, japanese food maker.
The catch phrase "YAMERARENAI TOMARANAI" is well known by every body in Japan.
It means "I can't stop".
Yes, If you open the packge of it, you will eat up soon.
This simple catch phrase is really fit this snack.
I usually eat it with beer.