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That morning, everything went wrong. Naho had overslept and was rushing to get ready for school when she suddenly saw a strange envelope with a letter written in her hand. It was as if she had written to herself from the future! As if the ten years older girl decided to protect her younger self from fatal mistakes. But this is impossible!

How can you even believe this? It seems that Naho from the future has foreseen this, describing in detail what will happen next and how to act so that it is not too late. The letter seems to be convincing, but it is also too fantastic. And her older version should know that. However, the girl has no doubt that the new kid in the class, whose name is Kakeru, will play a special role in her future.