The prequel to "Fist of the North Star", the protagonist Kasumi Kenshiro was originally a lecturer at a university in Tokyo. He deliberately hid his abilities and usually acted like an ordinary person. But later, his friend Li Yongjian from the Qing Gang came to Tokyo to find him and said that his friend Pan Guanglin and his sister Pan Yuling were in trouble, so Kenshiro set off alone to Shanghai to save them.