One of the children is shown showering. We are only shown their feet and bottom of their legs.

Two boys (Akira and Shigeru) are shown in the bath together. Only their heads and chests are visible.

Their mother is seen smoking in one scene.

The children's mother comes home slightly tipsy one night, you hear one of them say that she "smells of booze".

The idea of little children living helpless without a mother might unsettle some viewers, and the hardships they go throguht might be emotionally unsettling.