Yandere rengoku x y/n

⚠️Warning⚠️ This will be based heavily on an oc of mine. The reader is female.

Y/n is from another world that is based farther in the future.
This is my first story.
Storyline ideas and recommendations are welcome.
I'm thinking of making different story endings for every love interest.
Certain things from the manga will be changed ( like the Major characters' deaths).

I do not own or claim Demon Slayer-Kimetsu no Yaiba