The Gun Like Lightning(1960)

Sadao, is saved from death at the hands of Goro, a killer belonging to a rival gang by Joji just released from prison who has resolved to turn over a new leaf. He has returned, however, because of Keiko, his sweetheart, who he now finds is engaged to Noboru, a detective and son of Jinsaku, boss of the Otsu gang. That night at the night club, headquarters of the Highlight Group - which Noboru is investigating, Majima meets Joji who knows of his attempt to kill Jinsaku, and resolves to kill him.