Episode 1

Story
Simon, a 14 year old boy who lives in the underground village of Jiiha, is just doing his job of digging, but as he digs he uncovers a small drill that glows at his touch. He leaves his hole and comes out to the village, where a few girls see him and mock him. He walks away with his head down and bumps into Kamina, a person he calls Aniki, even though they have no true relation. He grabs Simon and says he is heading to the surface. They ride some mole-pigs to try and break through the roof but are foiled by the village leader, who says Kamina is a liar about the surface, just like Kamina's father. Kamina claims he and his father went to the surface earlier, but no one believes him so he is thrown in jail, and Simon is sent back to dig more. While he is digging he finds another discovery, a face. He quickly rushed to break Kamina out of jail. He says he will take Kamina to the face he found, but the village leader finds them again. But before he can punish them, a gigantic robot breaks through the roof, and with it a girl.

They try to fight the machine but are no match to it, so Simon says he will bring them to the face and maybe it could help them. Simon brings Kamina and the girl to the face, and the drill over his neck starts glowing more, and he learns that it can activate it. He activates the mini-mech, and confront the larger "Gunmen" as they are called. Kamina says that "Heaven may forgive you, but this Lagann will never" which gave the mini-gunmen the name Lagann. Using the drills on Lagann they defeat the enemy, and break through to the surface, and the girl tells them her name is Yoko.

They are amazed at the site of the surface, but their amazement is changed to fear as they face 2 more Gunmen.