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Artist's commentary
Librarian Koa
1. The elder of the Koakuma sisters (post #2119382), short hair
2. The day librarian, both her appearance and personality are better than the long haired one, but she's also a devil.
3. Female customers who break the library's rules are sold to her younger sister's bar.
4. Marisa is too fast at running away, so she has yet to catch her.