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On a certain planet, human technology is highly developed, but the number of humans is sparse. In order to maintain the functioning of society, humans set up purification organizations, go to various planets to find monsters that can mimic humans, bring them back to their own planet, and teach the monsters to become "humans" in the purification base.
The members of the Purification Organization are called Purifiers. On this day, they were looking for traces of monsters on a planet with a large ocean...
Purpose: Chasing freedom