Japan nowadays. Tomoko, a little girl, visits the city of Hiroshima. That's where she admires the statue of a crane, symbol of peace, called the "Bird of Happiness". Suddenly, the statue starts to sparkle and even to move. Another little girl then appears through the lights, Sadako, who lived in Hiroshima after WW2. She starts telling Tomoko her story. The two little girls soon become inseparable...