Otsu Tsurugaya (鶴ヶ谷 おつう, Tsuruyaga Otsū) is one of the supporting characters of Okami-san and Her Seven Companions series. She is a member of The Otogi Bank and the current Maid of the club who has an obsession with returning favors, which is because in her childhood, one of her close neighbors saved her from an incoming bus, and in doing so, lost his life. Because of this, she works hard to completely return any favors from those that help her. Ryoshi Morino and the other members of the Otogi Bank eventually help her to get over this obsession of returning favors.
- Otsu's surname Tsurugaya means "crane, stork" (鶴) (tsuru) and "valley" (谷) (ya).
- Otsu is based on the crane from the Japanese tale Tsuru no Ongaeshi.
- Otsu enjoys being a "maid" and she will not cosplay as anything else as doing so causes her much distress for that reason.
- Main article: Otsu Tsurugaya/Gallery