After Mutta completes flight training, he officially becomes an astronaut. Now he must wait to see if he will be assigned to a lunar mission.

Mutta's flight training is progressing well. Meanwhile, Hibito heads back to Japan, where he is greeted by cheering crowds and parades. He also gets a chance to visit Sharon.

Mutta is struggling with his flight training, as Deneil constantly distracts him when they're in the air. Can Mutta survive Deneil's unique style?

After retaking the written test, Mutta is able to move on to T-38 flight training. Since he had the lowest score, he's assigned to Deneil Young, who apparently has a unique training regimen.

After learning that Sharon has ALS, Mutta has trouble concentrating, performing miserably on the written test. He must now retake the exam before he can begin flight training.

At Serika's request, Sharon returns to the hospital to see a neurologist. Meanwhile, Mutta's concern for Sharon distracts him from his upcoming, written flight exam.

The astronaut candidates now prepare for training on T-38 jets. Sharon happens to be in the US to present her proposal for a radio telescope on the moon. She now heads to Houston to see Mutta and Hibito.

Hibito has finally returned from the moon. He now begins the long process of physically readjusting to Earth's gravity. Meanwhile, Mutta is preoccupied by Amanti's warning.

The Comeback Competition has ended, and Mutta's team finished second among AsCan entrants. Mutta is soon joined by his parents, as they prepare for Hibito's return to Earth.

It's finally the day of the Comeback Competition. Team E is scrambling to modify their rover, so the mud won't render its sponge tires useless. Mutta and Serika head to the hotel to look for something that could help.

Azuma and the other astronauts land on the moon, to replace Hibito. Back on Earth, it's finally time for the Comeback Competition. However, the weather doesn't want to cooperate.

As Mutta, Vince, and Pico gather for a drink, Vince and Pico are reminded of their past.

Mutta and the rest of Team E are slowly making progress with their CanSat for the Comeback Competition. However, their first attempt fails miserably, as the parachute fails to deploy and the rover gets stuck. Can they complete their CanSat without any help from their advisor?

After completing survival training, the NASA astronaut candidates are tasked to participate in the upcoming Comeback Competition. Each team receives an advisory engineer, but Mutta's team is stuck with someone who won't help.

The astronaut candidates have reached the sixth, and final, day of survival training. But Mutta is down with a fever. Can Team E complete the training?

As Mutta and his teammates try to keep warm in the cold desert night, Mutta is reminded of recent events.