Team Dai-Gurren managed to take control of the enemy fortress, but is still mourning on Kamina's death, 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 a horse-faced Gunman appears.