Zodiac Killers (1991)

Hong Kong student Ben Lee becomes friends with his mainland Chinese classmate Chang Chih while studying abroad in Japan. Ben is unmotivated to study and only cares about money and on the other hand, whenever Chih encounters a Chinese person, he would ask whereabouts of his childhood sweetheart. Ming is also from Hong Kong and in order to elevate his social status, he becomes involved with a bar hostess and owner Yuriko, hoping to become Yakuza leader Yamada Ishikawa's brother in-law.