A cutting-edge Aegis destroyer, Mirai, and her fresh crew, under the command of Capt. Umezu Saburo and XO Kadomatsu Yosuke, find themselves hurled back to June 4, 1942, amidst the pivotal Battle of Midway during WWII. Determined to tread lightly on historical waters, they witness events unfold without interference. Yet, when faced with a critical choice involving Lt. Commander Kusaka Takumi, XO Kadomatsu's compassion steers them towards an unexpected alteration of fate.