Kokuyo's Campus notebook has been Japan's student notebook for fifty years, with over 3.7 billion sold. But when students said it felt boring, Kokuyo built a whole new line of stationery around it, each piece solving a small everyday problem. A slim hole punch you clip to your binder, a pen case that opens flat like a tray, sticky notes that extend the page, a roll of notes in a case, and an eraser shaped to fit your hand.