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That day, the world was in crisis and invaded by darkness. He became a member of the light and defeated the darkness. Later, when he woke up again, he came to a magical world. The girls here actually run around on the sea with huge turrets on their backs! ? They are called ship girls! So, what are these sea monsters! ? They are called deep-sea habitat ships! Hey, where did this high-tech ship girl organization called Siren come from? ! ... To put it simply, this is a protagonist with a light factor who takes his girls to various different worlds to [spectate]. A story about a battle of wits and courage with the sirens (air).