After the Musashi rebellion, the girls from Yokosuka Girls' Marine High School have safely returned home. Sadly, the Harekaze suffered severe damage during its final encounter and may not be seaworthy again. Adding to the uncertain future of the Harekaze-class is the spreading rumor that it will be dissolved due to a lack of a vessel. Attempts by other classes to recruit Harekaze crew members only exacerbate the situation. The solution to this serious predicament may lie in sealed orders that Kouko Nosa, the Harekaze's secretary, is responsible for delivering to the crew. However, time is quickly running out.