Image from Baskin Robbins Japan.
Baskin Robbins Japan has been churning out (no pun intended, really) ice cream in that island nation for 40 years. To celebrate this, they're selling a special "anniversary sundae" made up of one scoop of ice cream with a bit of whipped cream and some colorful candies. I guess the 40th isn't nearly as impressive as some others since that's a pretty puny sundae.
The mugs are actually rather nicely designed to have both a retro feel (the stripes bring about thoughts of old-timey ice cream parlors) and modern elegance. If I were in Japan, I wouldn't need another mug (as they appeared to reproduce when food touches them like porcelain tribbles) so I probably wouldn't buy the sundae to get the cup, but I'd surely get one if I hadn't had a cabinet overstuffed with dishes. Note how they kindly put the sundae in a paper cup inside of the mug so that you don't mess it up with the food. Also, the sundae being so anemic means that it'd languish down in the bottom and require some sort of deep sea camera to get a picture of it for promotional purposes.
They are available only at some Baskin Robbins shops and in limited quantities. No price is given because old "31" is a franchise and pricing is controlled to some extent by the owners. They will be available up until May 10 or the end of their supplies. You can choose your scoop, but I'm guessing you can't choose whether you get the pink or green mug.