Musashi has been beaten, and the girls from Yokosuka Girls' Marine High School have returned home safely. The Harekaze, on the other hand, suffered catastrophic damage during its final fight with the Musashi and may be unable to sail again. Furthermore, speculations circulated that the Harekaze-class might be abolished owing to a shortage of ships. Other classes' attempts to scout members of the Harekaze's crew exacerbate the problem. The solution to this catastrophic situation may be discovered in the sealed orders that the Harekaze's secretary, Kouko Nosa, is to send to its crewmembers. However, time is running out...