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Before joining Tamakoma Branch, she was part of Headquarters. Two years before the start of the series, she was the operator of Kazama Unit during its early years. She moved to Tamakoma Branch around a year before the series began.
Shiori first meets them very surprised by there visit. She prepares some sweets for them and explain about the members of Tamakoma Branch. She also explains about the away missions.Then she gives them a tour of Tamakoma Branch an gives them each a room. The next day she explains the roles in Border and then assigns the roles. After Shiori introduces Osamu, Yūma, Chika to Tamakoma Branch. she introduces them to Mikumo, Chika and Yuma`s mentors. She also helps them decide which position they would take. (attacker, Shooter, sniper).
When questioned by Yūma as to why he is with Yōtarō, Yōsuke explains that he's babysitting "that little bastard" for her, while Yōtarō tells Yūma that Yōsuke and Shiori are cousins. Yōtarō also explains that Shiori and Kyōsuke were both HQ members until a year ago. Later, she appears at the meeting, aiding Replica in his explanation of the Neighborhood.