In the aftermath of a fierce clash with Emperor Zordar and the Comet Empire, the Yamato returns in the year 2201. Sanada, Aihara, and Shima, now recovered from their injuries, visit Okita's memorial to honor their fallen comrades. There, they encounter Tasuke, the son of Tokugawa, who plans to join the crew upon completing cadet school. As Tasuke graduates, a mishap occurs when he unwittingly overturns a boat carrying new cadets who are awestruck by the Yamato. Despite initial launch difficulties caused by the inexperienced engine crew's errors, the Yamato embarks on what was intended as a routine training expedition.