After the events of Gunnm, Gally is rebuilt through Desty Nova’s nanotechnology and discovers that the secrets surrounding Zalem are only a small part of a much larger world. Determined to find Lou and finally understand the origins of her forgotten past, she leaves Earth and becomes caught in the political and military rivalries between the major powers of the colonized Solar System. Her journey eventually leads her to the Z.O.T.T., a massive tournament where fighters from different worlds compete. Through extreme battles, revelations, and interplanetary conflicts, Gally continues her search for identity while discovering an entirely new dimension of the universe around her.