Killer sans who kills innocent people every Au with the Bad Sanses. Until they found a simple normal Lady Y/N unlike others and Nightmare start keeping her as a Pet and bring her to a castle with them.. Days later till Killer kept along with Y/N and Killer is getting weird and soft when he's along with Y/N weeks later, Nightmare notice about Killer and Y/N getting along and he's not mad at all, Nightmare sees her like a Daughter to her and other two Dust and horror and error sees her as a sibling as well. till the ending of the story, Killer start confess to Y/N how he feels and Y/N is blushed and accept the confession and they get a happy ending ..
22 parts