A young boy uses his scientific skills to fight enemies.

Thirteenth season of .

While looking for the ledgendary Mapman, the last surviving member of the Nomad Star tribe, Lipumira finds him in Tokyo. His name is Gen Tokishima and he is the only one able to get one part of the starmap hidden within the Earth. After retrieving the piece, Gen must make a decision to follow Lipumira in her foolhardy search to find the remaining pieces of the starmap or stay on Earth. He makes his decision, only to find his girlfriend has beaten him to the spaceship as she wants to come as well. Unfortunately, as Gen learns the secret of the starmap, Lipumira's sisters have plans to stop her and will stop her at any cost.

Aki Itou is a normal highschool girl doing normal things: reading books, feeding stray cats, eating at restaurants with her friend Kumi, dreaming of being an adult, and admiring the boy she likes. However, reality is not always kind to girls with dreams, as she finds out.