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Character:

She is twenty-two-years-old and is initially ranked Library Clerk First Class, but is later promoted to Library Clerk Supervisor. She joined the Library Defense Force's Kanto Library Base in 2019 after being inspired by a high ranking Kantō Library Defense Force member who saved a book she wanted to buy that was targeted for censorship. She holds this unknown person in high regard, thinking of him as her "prince", and she wants to be an "ally of justice" as he was for her. 

Source from Wikipeida