Yotaro, a taxi driver, is arrested on suspicion of murdering the company president Iwashima. The son, Kohei, believes in his father's innocence and begins to investigate the truth with his lover Hiromi, but they soon find out that Tetsuya, an orphan and idol singer whom Iwashima was helping as "Uncle Ashinaga", and Seyama, who was extorting money from Iwashima, are suspicious. The guys emerge. And this time, Seyama is killed by someone...