Pirates: After being exiled by the Warring States Period, I started building a city

He came to the pirate world in a disguise, but because of the upper limit of the Earth race, he became a weakling and was even sent to the 157th branch, which is known as the Navy's retirement home. However... a few years later, the 157th branch, which was originally a dilapidated building and a few marines... reappeared in front of everyone as a modern city! ...