Battle Sub Ryujin — Introduction，第 23 頁

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Humanity has rebuilt civilization beneath the oceans, but the depths are already claimed. When an underwater city is destroyed by the Othryx, an alien species that sees humans as a threat to its world, the United Underseas Nations deploys its most advanced warship: the Deep Sea Cruiser Ryujin. Its crew must confront a powerful enemy while uncovering whether this war is a fight for survival or a conflict that could still be stopped.