Mira Konohata (voiced by Chiba Takayanagi) once made a promise with a boy to "find asteroids". As time went by, although Mira and the boy had no contact, this promise was still remembered in Mira's heart. In order to fulfill the promise, Mira, who was promoted to high school, joined the school's astronomy club. Who knew that in order to save club funds, the astronomy club actually merged with the geology club this year and became the Geology Club. Aoi Manaka (voiced by Ai Yamaguchi), who is honest, taciturn, and even a little shy, Mai Inose (voiced by Yuya Kuroda), who is a senior but very weak, Meiko Sakurai (voiced by Nao Toyama), who is often mistaken for being angry because of her overly serious personality, and Mari Morino (voiced by Sumire Uesaka), who is carefree and always lives in her own world, love for the sky connects these girls with different personalities together.