In this world, humanity is 98% pirates. The Earth is mostly covered by ocean, with numerous islands on it. Many of the islands have cities. Each city has its own pirate crew and headquarters. There are also pirate schools for children in cities. Pirate crews may have an alliance with other pirate crews, but most of them are enemies. In this world there are also things like mermaids, fishmen, islands of amazons, and other sea-related folklore. Those creatures are pirates too