Muramasa is a playable character from the Senran Kagura video game series. She's a cat-ear wearing, mechanized robot. Abandoned on the side of the street, Hibari picked her up. Her birthday is on April 7.
- She loves Hibari and wanted to be useful to her, so she became a ninja.
- Yagyuu is a bit annoyed by her because she feels that Muramasa is getting in the way of her and Hibari's relationship.
- She has the habit of jumping on Fūma in the onsen bath.
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