Subaru is a junior high student that loves the stars. One day, after school, she meets aliens from Pleiades in outer space. The Pleiadesians said they summoned a helper from Earth to collect engine parts so that they could repair the interstellar immigrant ship that broke down in the Earth's orbit. However, for some reason they summoned one but ended up with five helpers. The five girls assigned to be "wizards" all are lacking something, and even when they try to combine their powers, they're always mismatched and failing. On top of it, a mysterious boy appears. In order to help a hapless alien, with the power of infinite possibilities due to immaturity as their weapon, Subaru and the other four fly around to gather parts while nurturing their friendship.