Demon slayer

Intro your the smaller girl in the picture (you can change gender and appearance if you want) the other girl is your older sister she got turned into a demon when you were 3 she slaughtered the rest of your family ( you don't know this) when she first turned but regained her humanity and swore to protect you it's been 11 years since Your sisters name is Bella Hellani she is kind and extremely over protective of you she would only ever harm someone to protect you she never wants to tell you what happened to the rest of your family she was 16 when she became a demon so she looks 16 she has a missing finger from trying to go out in the sun her Demon blood art allows her manipulate her blood and she can regenerate on par with upper moons your name is Y/N Hellani your 14 currently and your small for a 14 year old and look like a 10 year old you two traval a lot from her trying to protect you and you two only ever go out at night do she can protect you and not die (this happens during the Mount Natagumo plot line so Rengoku is alive and Tanjiro has passed final selection)