This is a very sad story without making you depressed. It's a story of 4 children who were abondoned by their mother and whom nobody in the society knows that they exist. 4 children expressed in the films are so lovely and special that you get frustrated with the Japanese society that appears to be very polite and caring to others on the surface but can be cold and indifferent to others in different levels, which is the reason why these children could exist without being known to neighbours, to landloard, to authorities, etc. The mother who left them was also cruel but at the same time her action reflects the cruel side of Japanese society which stigmatises unmarried mothers, children without fathers, resulting in her drastic choice she had made in order to be happy as a woman rather than as a mother. Akira, the main character in the film, is excellent in his role in raising and protecting his siblings within the world of their own. This is an excellent film to watch.