During a secret visit to find her long lost father, Yukari Morita is recruited by the Solomon Islands Space Association (SSA) director to train as an astronaut.

After training, tests, and a space suit fitting, Yukari learns of a local tribe led by her father and travels to him, where, to her surprise, she meets her half-sister.

Yukari and Matsuri may be sisters, but they couldn’t be more different. Will these differences strain their fledgling relationship to the breaking point?

With equipment needing immediate repairs, the girls unexpectedly have some free time. However, Yukari insists on being kept in the loop and won’t accept “no” as an answer.

The news has spread across the entire world: The SSA’s astronaut is a high schooler. Now with the press converging on the islands, the girls are thrust into the spotlight.

Something went wrong. Yukari made it to space, but the ship’s malfunctioning. Now she must work together with everyone else on the ground to make it back home.

Yukari and Matsuri have wound up in the most unexpected place imaginable. Amidst the turmoil, Akane offers her assistance.

Akane arrives at the SSA, but she’s not looking for a tour. Inspired by Yukari, she instead announces her intentions of becoming an astronaut.

When NASA astronauts run into a problem, the director seizes the opportunity to show what the SSA is truly capable of.

Yukari and Akane prepare to rendezvous with NASA’s space shuttle. They’re there to help, but not all the astronauts are happy to see them.

The astronauts work together to come up with a plan to save the unmanned probe. So far, everything’s going according to plan, but that’s always subject to change…