Lewis Smith and Isami Ao meet each other in Oahu, Hawaii during joint American-Japanese military exercises under AD-RIMPAC when a mysterious enemy invades the island. When all hope seems lost, a mysterious talking robot named Bravern appears and asks Isami to pilot him into battle, revealing that the invaders are "Deathdrives", super robots who rely on the power of humans to pilot them.
After the first Deathdrive, Superbia, is destroyed, he ejects a young woman named Lulu, who Lewis cares for until she recovers. Upon awakening, she begins to develop both physically and mentally, learning to speak, eat, and walk.
