20 years ago, Satsuki was sentenced to prison on suspicion of murder and has been serving her sentence ever since. Today, she has completed her sentence and is able to experience the outside world for the first time in 20 years. However, Satsuki is stunned by how much the outside world has changed. She can't find a public phone and can't contact her family. Just as Satsuki is at a loss, a young man appears...