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|Japanese name:||依藤 澄子|
|School:||Kentani High School|
|Grade:||Second-year high school|
|Debut:||Saki Achiga-hen, Chapter 5|
|Voiced by:||Yuko Mori|
Sumiko has a shoulder length green hair with matching green eyes.She wears the standard Kentani high uniform with knee high socks.
National Tournament ArcShe was quickly beaten by Yuu Matsumi during their match in the second round of the inter-high tournament.
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