Thousand Cranes (1989)

April 1954. 12 year old schoolgirl Sadako thinks her main problem is being unable to pass the baton in relay races. But just as her team starts winning, she starts getting tired more easily. She is sent back to the American Base Victory Hospital, where the diagnosis is lymphatic leukemia. And she has no more than a year left to live. Her parents agree with the doctor that Sadako should not be told, but will she find out anyway ?