A baby dinosaur was born from the giant egg that was brought to the pet shop Shikatani. The dinosaur thought that the daughter of the store, Uiba, was the mother. Uiba called the dinosaur Muka Muka because that was all the dinosaur can say. Muka Muka ate a lot and played a lot. He caused a lot of commotion in the shopping district. This anime shows the "at home" world of Uiba's childhood friend Senta, her older girl friend Hazuki, and the other people of the neighborhood shopping district.