Who didn't want to change something in their past? Pensioner Petrushevsky was given such an opportunity and his native Leningrad, in the spring of 1968, met Dmitry Sergeevich with forgotten realities. A student of grade 10 in a new way perceives his place in this life. From the height of decades and habits from the twenty-first century, it is not easy to exist in the former reality. Re-making his way through the milestones of his life, trying to change something, the main character does not immediately recognize another side of his story. Past and present intertwining create a bizarre picture of a new biography, which the pensioner fixes for posterity in the diary. The hero acts within the framework of his worldview and idea of ​ ​ reality.