Four former high schoolers in the same astronomy club reunite as adults and reflect on their past aspirations.

Asuka Mochizuki reconnects with her high school friend Hibino Hikari after 13 years. She suggests a trip to the planetarium with an important question.

Asuka discovers that Hikari has been chasing her space ambitions but is close to abandoning her life-long dream.

Asuka is inspired to help Hikari who has abandoned her astronaut aspirations.

Asuka reunites with Hikari and suggests building a micro-satellite together after remembering their high school pact. She reaches out to Shu Mizuhara, an old member of the astronomy club.

Asuka is determined to revive her high school dream of an astronomy club. Despite Amane's refusal, she secures Haruko's contact information.