This is an item of stationery (paper or writing goods), or other small merchandise such as good-luck charms, mascot straps, et cetera.
Tomoyo Sakagami has a reputation for being violent, but you'd never know it from the wistful look she wears on this bandana! In a nice wedgewood-blue color with darker blue printing, it's perfect to keep the sweat out of your eyes on a hot day, or to wrap stuff up in, like a Japanese furoshiki. It's a versatile size, too, at 54cm (21 1/4 inches) square. You never know when one will come in handy--take it with you everywhere you go!