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Papillon
Papillon was a wealthy teenager who lived in a mansion with his parents. He was sickly and often wore masks to hide his face. One day, he was attacked by a monster and was saved by an alchemist named Renkin. Renkin gave Papillon a Buso Renkin, which is a weapon that can be used to fight monsters. Papillon and Renkin became friends and fought together to protect the city from monsters.