All life originates from water and will eventually return to water.
After the end of the world, the surviving humans faced an unrecognizable earth. The advent of the Fourth Ice Age meant that this land was no longer suitable for human survival, so the ocean became the final destination for the survivors.
Then, they met the uncrowned king of the vast sea-the mermaid.
When the once glorious history of mankind is gradually buried by time, when mermaids become the new overlord of the earth, and when mermaids and second-generation humans completely replace land-based humans, the old era will come to an end and the Deep Blue Era will begin a new chapter.
This story takes place in this endless deep blue.
I'm going to pause my article writing and update another article that has been saved. I'm sorry, my update speed is too bad... TuT