Li Wanqing (Zhi Neiyang), the brother of Li Honglong (Zhi Mei Yuezi), a Sino-Japanese mixed-race girl, is an invincible boxing champion on the surface, but in private, it is a secret agent sent by the Royal Hong Kong Police to Japan to inspect drugs. However, during a certain investigation, Li Wanqing mysteriously disappeared, and the Hong Kong police had no choice but to send Li Honglong to Yokohama, Japan to investigate. The red dragon arrived in Japan and learned that his brother's disappearance was related to the businessman's important minister Kasaki. Under the cover of ordinary trade, Kawasaki secretly carried out drug smuggling activities, and his men even nurtured a group of fighting experts of different schools from all over the world. Knowing the arrival of the red dragon, Kaozaki sent his minions to hunt him down. With the help of Shaolin Temple boxing master Fujita Fujita (Akio Ueda) and his disciples Seiichi Seiichi (Meiichi Chikawa) and Akimi Hayakawa (Akimi Hayakawa), she waged a fight and confrontation with the Kokosaki criminal gang.