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Kawachi
Kawachi is a young man who is working as a part-timer at MgRonald's. He is a kind and hardworking person, but he is also very shy. He has a crush on Chiho, but he is too afraid to talk to her. One day, he is working at the store when the Devil, Satan, comes in. Satan is disguised as a human named Sadao Maou, and he is working as a part-timer at MgRonald's as well. Kawachi is surprised to see Satan, but he is also impressed by his work ethic. Kawachi and Satan become friends, and they start working together to help Chiho.