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Half a year after that, Tanegashima is busy preparing for the summer festival.
After graduating from high school, Sho Yashio, the hero of the story, who is a ronin (masterless samurai) aiming to become an astronaut, meets a man named Hashida Shi through Tennoji Nae, a JAXA employee who is an acquaintance at the port of his hometown.
After a long time, Sho Yashio meets with his childhood friend Akiho Senomiya and Junna DAITOKU at the former Robo Club.
Junior members of the Robo Club, Kojiro Frau and Subaru Hidaka.
The girl Ayune Airi, who became acquainted with him after the incident in February.
And along with Tennoji Nae and Hashida Shie, in the daily life of enjoying the summer, things that feel slightly strange begin to happen frequently.
It was a prelude to an incident that would plunge the world into chaos again.