Anarchy in Japansuke
A middle-aged man walks up to young man who is sitting under a tree and shoots him. The film then flashes back to 1981, where a young woman steals a car with a baby strapped inside. She decides to raise the child as her own, and teaches him to shoplift from stores while she works as a prostitute. She strikes up a relationship with a convenience-store clerk, and the two eventually settle down together.
Starring Kazuhiro Sano, Yumeka Sasaki, Yoji Tanaka, Taro Suwa, Shirō Shimomoto, Yukiko Izumi, Natsuko Sawada, Mariko Naka, Mikio Satô, Yuichi Minato
Watch "Anarchy in Japansuke" on Amazon released in 1999. It's a drama movie, and has a rating of 5.3 out of 10 from Imdb which is fairly okay for this kind of movie, and is currently only available for purchase or rent.