"Astronomy + Geology" is more fun than I expected? A girl who wants to keep a promise from her childhood starts her asteroid search! Mira made a promise with a boy she met at a camping site during her childhood to find an asteroid together. She wanted to join the astronomy club in high school, but this year, the astronomy club and the geology research club are merging to form the "Geoscience Club"?! This is the story of their adventure to find the asteroid they promised to search for together.