Despite her young age, Yukikaze and her friends hold a weighty responsibility as the naval force for their nation. As members of Seiran Team 3 at the Wadatsumi naval base, these female comrades attend the naval academy and possess a unique ability - instead of operating ships, they serve as weapons themselves, capable of swift oceanic navigation and armed with artillery. However, when a rival nation launches an attack on the strategic Wadatsumi base, it appears that all is lost when only Yukikaze remains standing. But, when a mysterious and stunning woman named Taiwa arrives with a secret weapon in hand, hope is reignited for the protection of Yukikaze and their precious naval base.
