Leftovers from the shows were put up on A!Smart for fans to buy. As always with this kind of merch, you must be a THE ONE member to buy (here is a guide on how to become a member).
The reversible tote bag for ¥4000 (made of synthetic leather)
The All over print kids tee for ¥ 4500 (made of polyester)
The Lamp for ¥5000 (this item doesn’t show up on the english website)
They also sold the All over print tee for adults earlier, but sold out (sale went live at 7PM Japan time, THE ONE members were sent an email at 2PM).