Where can you buy an eraser maker kit in Japan (or anywhere else)?

I saw this video on Youtube that shows how to create erasers with the eraser maker kit (I believe the manufacturer was Kutsua). Since I could not understand Japanese characters very well, I don't know what's the brand and where I could find it (in Japan or anywhere else). I have a friend that's in Japan. So, I was planning to ask her if she could buy the eraser maker kit for me. The problem is that I don't know where I could find it.