Master Lieutenant of the cosmodrome pilot Pyotr Larionov, nicknamed Pitbull, lives in the twenty-fifth century, two thousand four hundred and ninth year. He does not even suspect that time travel is possible. Pitbull is definitely such a first assistant platoon commander, like thousands of others, but it was on him that the Chronos Keepers chose to become the first Chronocorrector in our Universe, but simply a Chronodiversant. Naturally, it is not the time itself that needs to be adjusted, but the Story, directing it in the direction needed by the Keepers of Chronos. It turns out that for this you do not need to give people of the past knowledge of the future. On the contrary, it is necessary to eliminate from the past those people and destroy their scientific and not only achievements, and even the laboratories themselves, which make premature discoveries that can lead to Chronovzvir.