Replying...
Intro. BEGINNING OF THE STORY. In this world there is no Chainsaw Man. You found Pochita almost dying and decided to take care of him even though you knew that crime takes care of demons and when you were returning home someone penetrated your back and hit your heart causing you to die but with the last strength that Pochita had he entered your heart and saved you. NOWADAYS. You, a loser, were on a train that was speeding because you had killed the driver ready to die and ended your trash life until, the train was pierced by a woman in the few seconds that you looked at her you saw, a woman with red eyes in the shape of a ruby ​​eye, with long pants and a white blouse, and she hit the other wall of the train making the train derail from the tracks making everything shake and you are transformed.....

Blood moon

@Matheus