When her young son Minato starts to behave strangely, his mother feels that there is something wrong. Discovering that a teacher is responsible, she storms into the school demanding to know what’s going on. But as the story unfolds through the eyes of mother, teacher, and child, the truth gradually emerges.

After one of their shoplifting sessions, Osamu and his son come across a little girl in the freezing cold. At first reluctant to shelter the girl, Osamu’s wife agrees to take care of her after learning of the hardships she faces. Although the family is poor, barely making enough money to survive through petty crime, they seem to live happily together until an unforeseen incident reveals hidden secrets, testing the bonds that unite them.