This is the story of a man who has yet to realise what destiny holds in store for him. Far in the future, humans have lived underground, quietly and restlessly, for hundreds of years, suffering from frequent earthquakes and land subsidence. In Giha Village, one such underground community, live two young men. Simon is shy and naive, while Kamina believes in the existence of a "surface" world above their heads. Their destinies start changing drastically when the ceiling falls and a gigantic "Gunmen" and a beautiful girl named Yoko with a superconductive rifle come from the surface. Kamina, Simon and Yoko get on the "Lagann" that Simon digs out from the ground, and jump out to the surface! However, the surface is not such a dreamland as Kamina imagined. The world is ruled by the Spiral King and his army. Kamina and Simon, along with their comrades must challenge the Spiral King with Gurren Lagann if they hope to change the desperate world for the better!