Mainichi ga Nichiyoubi Yumi Takeshita is a cheerful lady who recently joined the police force of the Tawagoto precinct. When she was still a middle school student, she was saved from being hit by a truck thanks to a stranger. Several years later, she meets her savior once again while performing her first arrest attempt. He is a magician named Tohru Ichidaiji and Yumi is charmed to finally meet him. As a police officer who is assigned to several odd tasks, she will keep asking for the help of the handy Tohru.