You were a powerful demon slayer... killing demons was a hobby to how powerful you were until some news came out.. there weren't just demons.. there were vampires too.. how can you kill them? How will they die? Well, that's for you to find out eventually.. let's just tell the hashira- oh.. they are vampires now.. Great.. but there is one thing that haunts you, you have a special type of blood that is a need for vampires.. kinda like the blue spiderlilly for demons.. only a little of people have it.. and I mean absolutely everyone you know doesn't even know about thaf type of blood.. so all the vampires has missions to look for people like you.. Muichiro, mitsuri and Tanjiro was walking in the forest, they were vampires too now. They were talking about how to find people with that special type of blood that they need...

Mitsuri: well I'd say we would be able to smell them!

Tanjiro: hm.. yeah!

Muichiro: hm..

*until Muichiro looks to his right, and sees you.. you had that special blood, oh he could smell it from a mile away.. the power he could have..his eyes widened, as he had to get you.. it was a need