Dragon Ball Z

I got this can in a lot I bought on eBay.  And I don't know what it is.

Dragon Ball Z (front)

Obviously, the character on the can is from the anime show Dragon Ball Z.  At first I thought the 50/50 meant it was a half & half flavor, but upon Googling Gotenks (which I originally thought was the brand of the drink), I found this:

Gotenks is the powerful result of Trunks and Goten using the Fusion Dance, and the first fusion character to be seen in the Dragon Ball manga and the Dragon Ball Z anime. 

Of course!  What was I thinking?  Gotenks is a character.  On the side of the can it says "Helsi, all famous TV characters," so now I'm assuming Helsi is the brand.  But nowhere on the can is there a clue as to what kind of drink or flavor it is.  The back of the can isn't any help either, it's written in Japanese.

Dragon Ball Z (back)

 I'm not sure if this is part of a larger set or just a one-off collector can.  So I'm going to leave this on my Japanese shelf as a novelty item.