Five children save the life of a dog-like alien while at a self-run summer camp. He attempts to reward them by taking them to an alien colony on the Moon. Events take a turn for the worse when his report on that attack that injured him causes passage from the Moon to the Earth to be banned, and children are stranded in space. The children need to find a way back home before camp ends and their parents discover that they are missing. They also have to avoid the poachers that injured their alien friend, and now seem to be stalking them all.

The war between the Levamme Empire and the Amatsukami Imperium has been raging for years. In the midst of this struggle, the prince of the Levamme Empire declares his love for Juana del Moral and vows to end the war in one year, as part of his marriage proposal. When the Amatsukami catch wind of this, they assault the del Moral residence, targeting Juana's life. As a last-ditch effort to bring the prince his bride, the San Maltilia Airforce employs a mercenary of mixed blood—a bestado—to fly Juana to the prince in secret.