And happily, it turns out my theory was correct, and that this does match up well together. I was stumped for a name, though, so I just googled what "vanilla" is in Japanese, and from my exhaustive research (read, five minute search) the best I can find is "banila" (バニラ) so I just called this thing:
Banila GenmaichaThe green tea and the roasted nature of the rice really make for a nice counterpoint to the sweetness of the vanilla. This'd make for a very refreshing summer drink, and pair well with most Pacific cuisines, I'd imagine. The great think about DRY's sodas is that they're not overly sweet...it's nice to not have my teeth start to itch from too much sweetener. Definitely a combination worth trying.
2 teaspoons good genmaicha tea, or two teabags
1 cup water just off the boil
6 oz Vanilla Bean DRY Soda
Steep the tea in hot water for about 10 minutes, discard leaves/bags and chill. Once cooled, pour 2 oz of the double-strength tea over ice and add 6 oz Vanilla Bean DRY Soda.