So this is basically My Sister's Best Friend, My Lover except 1,000% more deranged (i.e., better). I'm so in.
I love how casually she whipped out the lockpicks lol. You think "oh this is gonna be one of those normal girl x freak kinda stories" NOPE, she's sniffing bras in the first chapter.
This is what sold me on the manga tbh. Normal x yandere is boring; crazy x crazy is A+++.
One day maybe there will be a yandere x yandere.