A girl crashes into Tokyo looking for a myth, pulls an ordinary guy into cosmic treasure hunting, and neither of them stops to ask if this is actually insane. The world keeps spinning normally around their ridiculous quest while they're out there risking everything for pieces of a map that might not even matter. By the time you realize what you're actually watching, a love story written across star charts instead of bedrooms, the OVA is already over, and you're left wanting more of something you can't quite name.

Lipumira comes to Tokyo searching for the legendary Mapman, the last survivor of the Nomad Star tribe, and finds him in Tokishima Gen. He alone can recover a piece of the star map concealed inside the Earth. Once he has it, Gen must decide whether to join Lipumira on her reckless hunt for the rest of the map or remain on Earth. He chooses to go, only to discover that his girlfriend, wanting to come along, has reached the spaceship ahead of him. As Gen uncovers the secret behind the star map, Lipumira's sisters turn up, intent on stopping her whatever it takes. The four-episode OVA mixes adventure, comedy and science fiction.