In China, the poor worker Nick repairs tractors and misses his sweetheart Xiu Xiu, back in Japan, she having never sent any news to her family or him. While illegally emigrating to Japan, Nick loses his Chinese documents and so cannot return to his country. He is welcomed by his countrymen who lodge and work in Shinjuku where they also help him to find illegal work. While running from a police raid through the sewage system where Chinese are illegally working, Nick saves Inspector Kitano from drowning in the dirty water. Later, after an incident with his cousin, Joe, and a Taiwan gang, Nick saves the powerful Yakuza boss Toshinari Eguchi. He is the husband of Xiu Xiu, who is now called Yuko and are parents of a little daughter. The mobster offers a dirty job to Nick; in retribution, he promises to deliver the quarter dominated by the Taiwan gang to him. Nick becomes the boss of the Chinese illegal immigrants.