As the looming battle against the Abyssal Fleet in Leyte Gulf approaches, the Kanmusu, young girls embodying warship souls, prepare for the decisive conflict. Among them, the Shiratsuyu-class destroyer Shigure joins the undermanned and underestimated First Striking Force, Third Section—dubbed 1YB3H. Tasked with a risky diversionary role, Shigure and her comrades face the possibility that this perilous mission could be their last stand. Determined to protect her allies, Shigure steels herself for the inevitable clash with the enemy. Amidst the journey towards Leyte Gulf, the unity and resilience of 1YB3H are tested as they strive to demonstrate their mettle as formidable vessels in the face of overwhelming odds.