At last, Team Dai-Gurren arrives at the outskirts of Teppelin, but before aiming to the city, they must face a combined full-scale attack of Cytomander and Guame's forces.
The last of the Divine Generals fall, and the city of Teppelin collapses, revealing a Gunman of gigantic proportions. Simon and Nia struggle to pass through it in order to confront her father, the Spiral King himself.
A recap of the story's events, as of episode 15.
During the following seven years, a new civilization rises and prospers under Simon's leadership. However, these peaceful times come to end when the threat mentioned in Lordgenome's last words starts to reveal itself.
After the Anti-Spirals' first attack and Nia's astonishing announcement, Simon looks desperately for her, while Rossiu finally completes his secret project.
As Simon arrives in prison, he unexpectedly meets Viral, who comments on how far he has fallen. Meanwhile, the truth about Rossiu's emergency plan and the consequences for those left behind on Earth are revealed.
One year earlier, Yoko starts working as a schoolteacher on an island until she learns of the situation at Teppelin and returns to break Simon free. Once again reunited, Simon and the members of Team Dai-Gurren launch themselves into space to protect the Arch-Gurren from the enemy forces, now accompanied by Viral as co-pilot of the Gurren-Lagann.
The Gurren-Lagann and the Arch-Gurren join together to form the massive Arch-Gurren-Lagann and stop the Human Annihilation System.
The members of Team Dai-Gurren make their preparations for the imminent war against the Anti-Spirals, but Rossiu is missing. However, when Kinon tells Simon about what he really intends to do, both start to look desperately for him.
Guided by Simon and Nia's feelings for each other, Team Dai-Gurren break through dimensions in search for the Anti-Spirals' home world. But after falling into the enemy's trap, they end up losing some of their most precious members, due to its vicious offensive.
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