Pirate Killer

A modern person who travels to the world of pirates obtains a system that can kill other people to gain experience points to increase their level and strengthen their strength.
He became a navy, and kept eliminating pirates in the navy. He was promoted step by step, and his ultimate goal was to become an admiral.
In this process, he kept fighting against pirates, four emperors, until he reached the top of the world, what was his idea?

Main characters: Ryan,

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