Everyone is lying when they are young, but the lies that Kobayashi Hiro said when he was only six years old, hesitating him every day to this day. He argued that he was abducted by aliens, and though it was quickly discovered that it was a hoax, thanks to nationwide attention, the city became a hot spot and a tourist stop for UFO lovers. Therefore, when a beautiful Yamada Meteor is transferred to Hiro School, he claims that he is an alien, and that Hiro-one who can save the planet from destruction, he thinks that this is a joke. He quickly finds out that she is not joking, and the meteor is here to check whether it is worth saving humanity from the monstrous asteroids heading towards Earth. To prove the value of humanity for the Universe, Hiro must fulfill the designated missions, except that the missions are a bit perverted.