In the fantasy world, the favorite profession of everyone is becoming a brave adventurer and hunting monsters. They go on quests to hunt monsters until the environment becomes endangered and the monsters are on the verge of extinction. That's why the Monster Keeper unit was established to protect and fight against the brave adventurers.

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In a fantasy world, adventurers hunt monsters for level and money, until the environment is damaged, a special unit monster keeper is formed to protect the monsters.

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The story of a special unit dedicated to protecting the monsters from the heroes.