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.

The series re-imagines the Glass Mask manga and its characters in a school gag comedy focused on satirizing modern society. (Source: ANN)

Based on the saga novel "The Human Revolution" by Daisuke Ikeda published in 1974-1999.

Sometime in the future, the world was completely dried up and became all desert. They had little rivers and lakes left, which villians and dangerous animals lived. Water has become the most valueable thing on the world. Whoever can control water will rule over the world.