When she was little, Mira Kinohata met a boy named Ao at a town camping. While gazing at the starry sky together, Mira learns that there's a star with the same name as herself, but no star named Ao. The two then promised to one day explore asteroids together and find a star to name it after him.

Several years later, Mira enrolls at the Hoshizaki high school and decides to join the astronomy club to fulfill her promise. However, she learns that the astronomy club will be merged with the geological research society to form the earth science club. Reluctantly, Mira goes to the club room and is reunited with Ao Manaka—the person she made the promise to explore asteroids with—and is shocked to learn that she is a girl.

The two are joined by upperclassmen Mai Inose and Sakurai Mikage, a second and third year student from the geological research society, and Mari Morino, a third year student from the astronomy club.

Mira Kinohata: Tomoyo Takayanagi (Island)
Ao Manaka: Megumi Yamaguchi (New Game!)
Mai Inose: Maria Sashide (Watashi ni Tenshi ga Maiorita!)
Mikage Sakurai: Nao Touyama (Yuru Camp△)
Mari Morino: Sumire Uesaka (Kono Bijutsubu ni wa Mondai ga Aru!)

Director: Daisuke Hiramaki (Watashi ni Tenshi ga Maiorita!)
Series Composition: Yuka Yamada (Kobayashi-san Chi no Maid Dragon)
Character Design: Jun Yamazaki (Sansha Sanyou)
Prop Design: Takuya Miyahara (Keppeki Danshi! Aoyama-kun key animation)
Chief Animation Director: Jun Yamazaki (Sansha Sanyou), Mai Matsuura (Watashi ni Tenshi ga Maiorita!), Marumi Sugita (Gekkan Shoujo Nozaki-kun key animation)
Art Director: Norifumi Nakamura (Kakuriyo no Yadomeshi)
Color Key Artist: Yuka Itou (GJ-bu color design)
Director of Photography: Seiichi Sugiura (Tada-kun wa Koi wo Shinai photography)
Editing: Kentarou Tsubone (Non Non Biyori)
Sound Director: Takeshi Takadera (Yuru Camp△)
Music: Takurou Iga (Tsuki ga Kirei)
Music Production: Flying DOG
studio: Doga Kobo

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