A teenage couple on a date witnessed what they believed to be a meteorite fall. Upon investigation, they discovered a baby girl who they named Morumo and adopted. However, their happy ending took an unexpected turn when Morumo grew to an unprecedented 16.4-meter height as a high school freshman.
Despite her unusual size, Morumo found contentment in her life and was well-liked among the locals and tourists. She attended school with her childhood friend, Miharu. One day, a scientist with a history of experimenting on young women injected Morumo with a serum that shrank her to one-tenth of her original size, but increased her density and strength.
For a brief moment, Morumo experienced an ordinary life until the serum's effects disappeared, and she returned to her colossal form. Eager to lead a normal life, Morumo was determined to find a way to maintain her shrunken size, even if it meant working with the same mad scientist.
Therefore, Morumo and Miharu put in the effort needed to achieve their objectives.
