Akiha escapes from her box prison but in the process, Imo-chan makes the ultimate sacrifice to save her and the Kirkwood colony from a missile attack. Just as the final parts to complete Leopard are collected, Leopard becomes possessed by his dark alter ego and decides he will be the one to rule over humanity. Nerval reveals that his goal was actually to have a better understanding of humans and forms an alliance with the Shishidos to defeat Dark Leopard. In the final battle to decide the fate of humanity, Akiha will have to confront her sister Nami to decide who is the real girl who leapt through space !