"Dirty Mama!!" follows single mother Takako, who works as a detective. She possesses the highest rate of successful arrests ..

Takako (Hiromi Nagasaku) is on a waiting list to get her daughter into a public daycare center and private daycare centers are extremely expensive. Because of this, Takako takes her baby to work. She has arguments with the baby's father who does not care about the baby and Takako does not get along with the conservative male detectives. Meanwhile, Takako trains new detective Aoi (Karina).

Nagasaku will play the part of Takako, a police detective and a single mother of a child who will soon turn 1 year old. She is described as “dirty” because she doesn't mind taking bribes or leaking information if it is to her own advantage. The series depicts her battles with the child's irresponsible father, her police colleagues who only think of protecting themselves, and the criminals in the cases she handles. Karina (27) will play a trainee detective whom Takako partners with.