‘Tengen Toppa Gurren Lagann’
In the distant future, people build their homes and raise domestic animals in subterranean caverns. As a result, they live in fear of the occasional earthquake and cave-in, and have been for hundreds of years. Jeeha is one such village.
One day, a boy named Simon happens to find a small, shiny drill while digging to expand the village. At the same time, Kamina – Simon’s “Bro” – believes that there is another land above the village, and tries to break through the ceiling in order to leave the cavern, but fails. Suddenly, an earthquake occurs, the ceiling collapses and a gigantic robot – a Ganmen – crashes to the cave floor.
Kamina is now sure that there is a world above them. Recklessly, he begins to fight against the robot, and discovers that another person has arrived from the land above. It is a girl by the name of Yoko from the neighbouring village Ritona. With a rifle in hand, she had been hunting the robot, but her rifle shots only irritated the robot. Trying to escape its attacks, Simon shows Kamina and Yoko what he had previously found: It is a mysterious robot with a head as its body.
And so this epic adventure begins…
Descriptions taken from AniDB.net