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In the future world, global warming will cause sea levels to rise, eventually submerging the earth and turning the entire world into a vast ocean. The nuclear wastewater and industrial waste that humans put into the ocean have created deformed monsters called sea monsters. The only remaining humans live on huge modified warships, looking for the possibility of survival in the apocalyptic deep sea. The appearance of diaries brings a glimmer of hope to mankind, but a greater disaster is quietly brewing...

Under the cloak of technology, a magical world of fantasy is hidden. In order to save the people, the demon king from another world traveled through the prophecy, the ordinary middle school girl who hides a secret, and various forces with different interests, take turns on the stage of the era that has changed but never gone away. Is this world a grand drama of the gods, or is it the final song of a group of ants...