Life Noble note
handmade note in Japan by craftsmans. Good design and good writing.
Frixion pens. It's convenient erasable pen and now they have such variety. Many colors of standard frixion ballpoint(many colors and line weight), frixion color pencil, frixion felt pens, end so on...
Highlighters. I love the color.
Eco staplers which doesn't use staples.
http://www.sunnypages.jp/travel_guide/modern_tokyo/fun_shops/Loft+Shibuya/1957