Just as General Domel was tried and found guilty because of accusations that he is partly responsible for Desler's assassination, Susumu, Yuki and Shiro explore, with the help of an alien device, the control center of an abandoned warp gateway created by an ancient civilization under Garmilas control. In the midst of a deadly undertaking, Shiro unveils a surprise about the Yamato 's navigational functions and his close friendship with Susumu's late brother Mamoru (as well as Mamoru's relationship with Kaoru)...