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. She is the current Maid of the club and has an obsession with returning favors. This 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 and the other members of the Otogi Bank eventually help her to get over this obsession of returning favors. She enjoys being a "maid" and for that reason she will not cosplay as anything else, as doing so causes her much distress.
- Main article: Otsu Tsurugaya/Gallery
- She is based on the crane from the Japanese tale Tsuru no Ongaeshi.