The owner of the Stray Cats store, and the person who adopted Takumi. She has a tendency to be away from the shop frequently due to the fact that she likes to help people the best she can, even if she has to go to the ends of the world to do it. This usually leaves the store with nothing to sell at times. She is able to accomplish many of her good acts thanks to the efforts of Chise. Otome's personality is described as reckless, by Takumi and Fumino. She is surprisingly clumsy at making cakes, and is not very good at it, despite being the owner of Stray Cats. The reason her business stays afloat is because many of the guys like to see her, due to her beauty. She is also known to be a celebrity around town, mainly for her heroic exploits.
Later, it was revealed that Otome herself was an orphan adopted by the Tsuzuki family, and her desire to help others were mostly an influence from her foster parents, who died in an accident when Takumi was in junior high. While Otome behaves frequently like an air-headed child, she is unusually perceptive about the people she meets, and can easily see through others if they are experiencing trouble of some sorts. A running joke involving her is the fact that since she has a large bust, there are not a lot of swimsuits that can fit thus the top tends to break. She often hugs Takumi into them as well, giving him plenty of sisterly affection which makes the other girls annoyed.