Egg Delivery Man : Attack on Keishicho (1975)

You-chan is a young man who delivers eggs from Tochigi Prefecture to Tokyo's city center, and he is an avid fan of yakuza movies. One day, he encounters an escaped prisoner during deliveries and becomes friends with him. Detective Arabuka shoots the man dead, and You-chan is arrested for obstruction of justice. After three days in jail, he becomes a member of the dead prisoner's organization.