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Washizuka Reina / Ninja outfit
"Gendai Ninjakko Zukan" #20 Washizuka Reina
She's from Kaga. She's a young ninja attached to the Shirakawa School (Shirayama Clan). She's a second year student at Saisei High School.
I've written more establishing materials for her here~ (free to the public):
https://fantia.jp/posts/2698865