We are running a campaign to get an original pass case with Thirty One Ice Cream. The period is until February 28th.
During the period, you can get a "redemption ticket" with one stamp for a payment of 400 yen or more including tax. Furthermore, if you pay 400 yen or more again at the same store the next day or later, another stamp will be stamped on the redemption ticket and you can exchange it for a pass case.
The pass case is made of rubber. Two types are available: the green-based "Popping Shower" and the pink-based "Love Potion Thirty One." Limited quantity, will end as soon as it runs out. Some stores do not carry out.