Their items change from time to time. Its worth a trip because they have so much stuff you didnt know you needed. Its a Japanese thing to solve life's little annoyances with a a dandy gadget.
If your looking for clay you can try checking the art isle they even have clay chissals and knives to carve the clay i dont know if they have it but you can check
Not sure. Japanese goods.
I don't no but the store is big so maybe
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