Based on Rieko Saibara's humorous semi-autobiographical manga about her life raising her two children.

Natsumi Mizuki is a 4th grader whose parents have gone to London. Her Aunt Izumi comes to live with her. Izumi is an aspiring manga writer who is trying to get her first big break, so she doesn't have time for a baby that appears out of thin air on Natsumi's first night alone. The baby's name is Mirai and her mother is *Natsumi*, but 15 years older. Somehow, Mirai had traveled back in time. Now the young Natsumi has to raise Mirai while trying to keep her 4th grade life from falling apart and keep Mirai-chan secret from everyone. She has the dubious help of Izumi and some baby-care gadgets from the future. (Source: ANN)

At the end of the first season, Doremi and her friends all had to give up their witch powers and be normal girls again. This also meant that they couldn't see Majorika, Lala, and the fairies again. The MAHO-Dou was also deserted and the door to the Majokai was locked. The Queen, having seen all this through her crystal ball, secretly makes it so that Doremi and co. all end up heading into the Majokai again, with the excuse to return Majorika's hair dryer. However they end up stumbling into a garden, and one of the roses reveals a baby! The Queen tells the girls that they must raise the baby for a whole year. To help them, they receive newer and stronger witch powers than before! The adventure isn't over yet!

By a twist of fate, a herbivorous dinosaur finds a lost egg and brings it back to her nest. When the egg hatches, however, a carnivorous dinosaur emerges. Unable to abandon the child, she names him Heart and raises him in exile alongside her own child. As Heart comes of age, he struggles to eat the same food as his family and runs away in disgrace when he learns that he cannot live properly without meat. Years later, the now feared predator Heart encounters a situation similar to his past—he spots a dinosaur egg opposite his kind. As it emerges, Heart remarks that the newborn is delicious-looking. The newborn herbivore thinks that Heart is his father and takes delicious-looking, or Umasou, as his name. Unable to eat a newborn who loves him, Heart reluctantly decides to raise Umasou as his own. As he nurtures a forbidden child like his mother before him, Heart struggles to deal with an unforgiving world and the true natures of predator and prey.