Enter the secret world of the Yakuza. Young Naoki Watanabe gets caught up in the wave of juvenile delinquency. He's a failure at school, work and in his personal life. His mother, driven by shame and despair, is reunited with an old friend, Mr. Imai, who offers to introduce her son into the ranks of the Yakuza.
His boss Kumagai, confronted by new trends facing Japan, feels that the Yakuza is being edged out of modern society. He takes Naoki under his wing and take him around the city of Shinagawa to show him the realities of the modern Yakuza. Divided by loyalties to his mother and to his new "family," Naoki will have to choose between the light and the dark.