Age: 27 (At the beginning of the series)
Birthday: July 22
Sign: Cancer
Height: 170 cm

Sumire has her strong points. She graduated from not only Tokyo University but also Harvard, has a successful career as a reporter, and her co-workers think of her as a cool and collected person. Things start to fall apart for her though at a drunken holiday party when she punches her lewd boss out, getting demoted to life style affairs at the newspaper. Then, her fiancé leaves her for his old girlfriend because Sumire is too intimidating for him.

Her life starts to pick up again when she find a young man in box outside of her apartment and decides to take him in for the night. But he doesn't want to leave, so they come to the agreement that he can stay if he is willing to be her pet!

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