In case you love this film which I think would be only 70% then I highly recommend nobody knows. It's the same as shoplifters as the title suggest nobody knows these kids are living alone. The climax in nobody knows is more powerful than shoplifters.
Both have a theme of child abandonment and the struggles that those children face. Nobody Knows is a lot more hard-hitting than Ashita, Mama ga Inai, however both titles show the strength children may have.