Captain Earth

One night right before summer vacation, Daichi Manatsu, a second-year in high school, sees a weird round rainbow floating in the sky above Seed Island (Shuushi/Tane Island) and ventures there alone. He has seen this rainbow before. With the memories of his father's mysterious death and an encounter of a mysterious boy and girl, Daiji arrives on the island while the alarm of a building labeled "Earth Engine" is going off. Someone asks him "Are you a captain?" just as robotic intruders from Uranus called "Kiltgang" arrive. The battle around the shining stars is about to begin.

Daichi was successful to unite the Earth Engine Impactor base formation. With a mysterious girl claiming to be "magical girl", he repel the Kil-T-Gang Morukin. Daichi's father was a Globe member once, he came back to the earth, knowing that it's organization protecting the earth from the invasion of aliens.

Yomatsuri Akari who is the only daughter of the Globe commander - Nishikubo - applied to the new team, they're enjoying the full summer of Tanegashima. In front of such four, a new enemy -Amarok- appears. Plateau with shaking off the restraint of Nishikubo,

Amarok and Moco from Planetary Gear commencing an assault on Globe base.

There are two factions divided over how to deal with the Kiltgang: the interception faction that wants to fight them and the ark faction that wants to send out a new humanity to escape. Commander Nishikubo, a member of the Interception faction, sends Teppei to rescue Eiji, the man who gave him his genes, aboard the orbital space station Tenkaidou.

Tippei's "father" has gone missing after the incident on the Tenkaidou. The "ark" faction seeks to allow a few chosen people to escape from Earth to avoid the Kiltgang. They try to steal Hana, because she is the key to their plans. Reito, who has been assigned as an observer to the Tanegashima base, tries to kidnap hana but is interrupted by Daichi, who stops him with his boomerang.