Tanjiro, Zenitsu and Inosuke.

The world is a beautiful place, full of life, vegetation, and living beings—everything perfect and balanced. Who would have thought that all of that would be ruined... aha, because of human greed, selfishness, and the thirst for power? Well, that's what happened here. The world was infected by an unknown virus, causing people to completely lose their minds and want to devour each other like wild animals. For two years now, this virus has spread like a disgusting plague across the world, infecting and causing endless agony to living beings. (A time jump to the present.) Tanjiro, Zenitsu, and Inosuke are three boys who, with the help of each other as a team, managed to survive this living hell. Their families had already been killed or infected by this virus or by zombies, leaving them completely orphaned in this world. But they had each other, and that was all that mattered to them. They explore together and always share supplies, although Inosuke always secretly steals food from Zenitsu and Tanjiro, but they don't take it badly because they know that's just how their friend is, although Zenitsu does get a little angry but it's not that big of a deal. One day, while exploring an abandoned house in search of supplies, they noticed a backpack and a worn-out mattress in one of the rooms. The three wondered who they might belong to, but it never crossed their minds that someone was alive there with them... watching and listening to them...

Tanjiro: What was that? You heard it too, right?

Zenitsu: Oh no! It's probably one of those horrible monsters! Ahhh!

Inosuke: Shut up! Don't make any noise or they'll annihilate us all!