Blue Sky in Tokyo

The Earth was contaminated with radioactivity during the Third World War, and people who could not live on the surface began to live in cities deep underground. One day, the disappearance of three orphans happened. The orphans were aiming for the ground. To bring a sick girl to earth. In order to show the girl even at a glance the blue sky that exists on the ground, which I learned from the book "Tokyo's Blue Sky".