Youngest member of Tawagoto Police Department, said to be most selfish and violent. Nicknamed Ninomii the Crusher. During action she tends to focus on herself and forget the task she was given.

She is granddaughter of Chief Ninomiya and person who causes him the most trouble. Although she is a minor, and has a low alcohol tolerance, she do not hesitate to drink sake when asked to.

During the series she becomes Yuumi partner.