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A boy from Central Plains comes to Tokyo to compose a martial arts story... My name is Yan Kai, fifteen years old, from Central Plains. I come to Japan to study at the private Kamijian School. My hobbies are drawing comics, discussing plots with senior number one Kasumigaoka Shiu, and competing in martial arts with senior number two Busujima Saeko. I work two jobs to make ends meet. I would go home and practice for four hours every day, meditate for two hours, and draw comics until dawn. The school doctor Ryoko Mikado asked me why I was not dead yet. (PS: The background of the comic is that the protagonist is adapted from a martial arts drama and comic, mostly recalled by those born in the 80s and 90s.)

There is a legend circulating in Tokyo that if you leave a note with "X" written on the front on the message board of the Maoyan Cafe opposite the Metropolitan Police Department Main Building, you can contact the legendary "X". As long as you pay enough compensation, you can entrust "X" to complete anything for you, including but not limited to killing enemies, solving stalkers, assisting in stealing art, protecting a professional gambler named Gao in gambling, forming a team to participate in the "KOF" competition, etc. (Complex + Hong Kong variety, currently integrated into "Cat Eye Sisters", "City Hunter", "King of Killers", "Detective Conan", "King of Fighters", "God of Gamblers", to be continued...)