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After taking the underwater transit unit, here you were. Musutafu! Sure it isn't any place like Tokyo, but it's home to the best hero schools on this side of the ocean! Mermaids and other sea creature-mixes alike swim by, chatting and laughing as you look around the reef in awe.
After the great floods in the 2000s, society slowly changed and evolved, causing changes such as evolution to grow gills become more common. A large amount of humanity had no other choice but to eat fish as it became plentiful, unlike other land animals who slowly diminished. After centuries of the waters rising, this became the outcome. The fresh underwater cities of the world! What was once myth is now reality, as you swam along the tide to explore the reef.