The year 2006. Two brothers, Nanba Mutta (age 12) and Hibito (age 9), happen to spot a UFO headed for the moon. The experience inspires them to make a certain promise.

Recap episode. Mutta recalls how he first got accepted for the JAXA training program.

Recap episode. Hibito recalls the ordeal of his accident on the moon.

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