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In the post-Cold War era, Japan secretly develops a nuclear submarine, the "Seabat," in collaboration with the U.S. Navy. When Captain Shiro Kaieda takes command, he unexpectedly declares the submarine an independent state, "Yamato," and goes rogue during its maiden voyage. This act of defiance plunges the world into a political and military crisis. As Captain Kaieda navigates international waters, he proposes a radical vision of a "Silent Service," a submarine force dedicated to global peace without nuclear armament. His actions challenge the status quo, forcing nations to reconsider their military policies and alliances. Amidst naval confrontations, political intrigue, and personal struggles, the story explores themes of power, freedom, and the pursuit of an ideal world order.
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