Itoya is amazing, it's like a wonderland of stationery! I also highly recommend kakimori, which builds custom notebooks that you can select all the parts for (

Itoya is amazing, it's like a wonderland of stationery! I also highly recommend kakimori, which builds custom notebooks that you can select all the parts for (binding, paper, cover, etc.). Really memorable experience, and it's in a quieter residential part of the city (but still fairly convenient/central) that feels very different from the usual tourist spots.