Books (novels and essays) Japanese literature WHY AM I NOT THAT BOY?

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Japanese literature
One day, Mijima Ten, who has escaped from a closed village and continues to write solo novels in a town where he has no relatives, receives a contact from his friend Mina from his middle school days. He found a "letter" that he wrote in his middle school days to each other as they have grown up, so he wants to open it now that he is 30 years old. It is a moving growth story that describes the heart that shakes with other people and the sparkle that resides in everyone's life.