Think I can sum it up in two words: too sweet. I got the sundae, which has green tea soft serve, toasted rice pieces and red bean paste (along with a cookie, mochi and chestnut on top). Ice cream is obviously sweet, and when the rice pieces are basically sugar disguised as rice and the red beans basically condensed sugary paste, you have a terrible combination that is sugar planet explosion.
The smallness of it is a blessing and a curse - not big enough to make you expire from sugar coma, but the price is certainly big enough to make you question why you paid 8 bucks + 15 min wait for it in the first place.
Overall: kinda novel but I've definitely had better.