The concept of the show is like a Mary Poppins set in modern Japan, with Mama Shingo entering a client's home and resolving family discord. In the first episode, Shingo Mama visits the Nagashima family and the client is the mother, Sayuri. The family here was not on good terms, with the father, eldest daughter Hikaru and eldest son Ken having various problems, including Sayuri, who is in the last month of pregnancy and is very depressed. In addition, the wandering student Dekouchi-kun has lingering feelings for his girlfriend, whose heart has already left him. Shingo Mama is a story about the Nagashima family and the people around them who struggle to smile and make them happy so that they can say "oh-ha!" with a smile.