Tengen Toppa Gurren Lagann takes place in a fictional far future where human beings have been forced underground and thrive in isolated subterranean civilizations. These "villages" have no contact with the surface world nor other villages. Since frequent earthquakes damage infrastructure, the villages must constantly expand deeper into the earth — individuals designated to this task are known as "diggers". Jiiha Village is the home of Simon, a fourteen year old digger who was orphaned when his parents were killed in an earthquake. He is respected by the village elder as the best of the diggers, but is ostracized by his peers. After discovering a special drill key deep in the ground, he is recruited by an eccentric fellow orphan named Kamina into his group, the "Gurren Brigade". Kamina dreams of the surface world, which he visited as a child with his father but had to return home because he was too weak to survive.

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