Kurus Uehara is an ordinary young man who has not yet decided his future. One day, while following his father, a television show director, to make a documentary with the background of the battleship Yamato, Kurusu suddenly collapses. It carried him back to the past where the battleship Yamato was still sailing gallantly during World War II. With the help of Kaiba, a single sailor on the Yamato battleship, a war game using Yamato begins.