Shiori Usami (宇佐美(うさみ) 栞(しおり) Usami Shiori?) is a character in the manga and anime series World Trigger. She is an Operator and a member of Border's Tamakoma Branch, serving as the Operator of Tamakoma First and Mikumo Unit, being originally a member of Kazama Unit, and also serves as an Operator for Yūichi Jin despite (or due to) the fact he's a solo agent. She is also the creator of the "Yashamaru Series".