__Gender__: Female
__Occupation__: P.E. Teacher at Morinomiya Academy

Married to Mamizuka Kousuke and the mother of the twins Mamizuka Kazuma and Mamizuka Takuma.

The manga centers on the brothers Ryuuichi and Kotarou Kashima. Ryuuichi is in high school and Kotarou is still a toddler. After their parents are killed in a plane crash, the two brothers find themselves living with the chairwoman of the Morinomiya Academy, who herself lost her son and daughter-in-law in the same accident. The chairwoman, however, has one stipulation for the brothers in order to live with her: Ryuuichi has to work at the academy's daycare center as a babysitter.
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(Source: Anime News Network)

__Height:__ 157.5 cm

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Umi Mamizuka