To new mother Sachiko Azuma, her baby boy is the light of her life. Accordingly, she names him Hikaru, Japanese for “to be bright.” Eager to raise her son, Sachiko gradually begins to notice that Hikaru seems a bit different from other children. He is reluctant to be held or hugged, and his growth and development appear slow. Sachiko’s suspicions are confirmed when it is suggested that Hikaru, at a year-and-a-half, may be deaf. A specialist, however, reaches a different diagnosis: autism.