A boy who doesn't know where he came from transmigrates to the Honkai world, only to find himself aboard the last train of the Previous Era.
Though he manages to scrape together some status through the identity he has in this era and his own hard work, in the end, he still can't save civilization from destruction.
At the final moment, clutching the core of the Herrscher of Finality, he returns to Earth like a shooting star. Looking out over a world with no one left but himself, the young man known in this era as Kutuzov is overcome with emotion.
Suddenly, he realizes something terrifying: he hasn't entered the cryo-pod yet.
Oh, suka blyat!
(Note: The Previous Era only appears in the prologue and a few flashbacks. It is not a major part of the story.)