Team Dai-Gurren managed to take control of the enemy fortress, but is still mourning their fallen comrade, especially Simon. After falling off a cliff, he notices a Gunman throw a capsule into a deep valley. Simon inspects it and finds he is able to open it with the same drill key he uses to pilot Lagann, and inside is a young human girl named Nia, but their introduction is cut short when an enemy Gunman appears.
Having been temporarily spared by Adiane, another of the Four Divine Generals, Team Dai-Gurren uses the reprieve to reassess their situation. Nia learns of Kamina's significance in Simon's erratic behavior and offers him some stinging, yet honest advice, which draws the ire of an untrusting Yoko. With tension building within the Team, the crew scrambles to stand by Nia's side when Adiane returns to complete her stalled attack.
Team Dai-Gurren falls into a trap set by the third member of the Four Divine Generals, Guame. The Team is taken captive and stored underground to await execution. While digging an escape path, Simon finally understands Kamina's last words to him and after having a discussion with Guame, Nia finds out the reason why she was thrown away.
Yoko, Will You Do Me a Favor?: On their way to Teppelin, the Beastmen's capital city, Team Dai-Gurren stumbles upon a vast ocean and must wait for modifications on the Dai-Gurren to be completed before crossing it.
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.
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