Banana Enema Massage?

I snapped this photo while I was in Japan a couple of years ago.

Kitemas: Keep it!! enema massage systemI’m sorry but given the definition of enema:

enema noun (enemas or enemata) medicine 1 the injection of a liquid into the rectum, eg to clean it out or to introduce medication. 2 the liquid injected.

source Chambers Online Dictionary.

I’m just flabbergasted… The Icing on the cake is the banana on the box, just what is that supposed to imply…