Ikki Makabe is a young boy who grew up on Ryugu Island, which is very rural in Japan. For him, peace like this is too common to be ordinary. But when the unknown creatures made of silicon, the Festum, began to attack Ryugu Island, he began to realize that his peaceful life was just an illusion. In order to regain his peaceful life, he and his companions began to fight against the Festum on the huge weapon created by humans, Fafner. At the other end of the fierce battle, what awaits him is...