|Japanese name:||水村 史織|
|School:||Koshigaya Girls' High School|
|Grade:||First-year high school|
|Debut:||Saki Achiga-hen, Chapter 6|
|Voiced by:||Rie Yamaguchi|
Shiori has medium length red hair and brown eyes. She wears the standard Koshigaya Girls' uniform.
National Tournament Arc
She is soundly beaten in her match during the second round of the national tournament. Her team did not advance to the next round.
Final Eight Arc
Shiori and her team were also seen after the vanguards' match at the side B semi-finals.