If you're looking for mochi specifically, then this is a place you'd want to try out. It's a cute little shop, that can be found inside j town supermarket, all the way to the left and shared with a sushi bar. Interior is clean and chic. Keep in mind, it's not a typical cafe where you sit and chat over coffee. It's a speciality pastry shop, which primarily serves mochi although there is a small selection of drinks you can purchase as well. We didn't spend too long there.
Lovely mochi (daifuku) selection ranging from cream to matcha at $2.5 plus tax each. In my opinion, that is a bit steep for an individual mochi, but if you're in the area, I would recommend buying one to try. Some are filled with flavoured cream and red bean (delicious)- recommended!