This is a story about personal tragedy and the coming-of-age of a young girl. At the age of 13, Mirai Onodzawa experiences the typical problems of any teenager her age. She tries to figure out who she is, to find her place in the world, and she sees indifference from adults and painfully takes in any words directed towards her. At times, the girl reacts aggressively to them, and she confides her secrets only to her mobile phone. Little does she know, the biggest shock awaits her ahead...