Demon Slayer: for My Sister and Everyone Else, I Will Kill Muzan

[Time travel, sisters, he ending, the protagonist has no clear CP, OOC apologies] As we all know, great luck is a summoner from another world, and I am the lucky one. Because of an accident, I traveled to the world of Demon Slayer, but I only found out about it more than twenty years later. When I found out, I didn't expect that I would encounter Wuhan that night. My sister and I both turned into ghosts. Now it's better, Wuhan! You hurt me both online and in real life! ! Just wait to die! ! ! I will bring disaster upon you. Wuhan: What is this dark pipe of yours? Xinyue: Xuanmi, leave him alone. Damn him. Wuxian: What do you mean I can still see the lost breathing technique from hundreds of years ago! Tanjiro: Breath of the Sun! Midouzi: Breath of the Moon! Me: That's right! Just like that, let's cut down without mercy, hahaha!