that one person

Ok so I need help finding a manga. I vaguely remember that it was about a daughter and son of two big yakuza bosses and the daughter lived in the countryside and she was called like country bumpkin a few times?? dont know why I remember that. But the son is kinda a huge psycho who's pretty obsessed with killing and has sex with like a new girl occasionally until he starts being obsessed about the daughter. At first he's completely uninterested in the daughter becoz "she's docile for a yakuza's daughter" but we soon found out that she has a badass personality of her own and when the son finds out he gets really obsessed. Im pretty sure their parents set them up but like the dad of the daughter is more of a father figure then the other dad. omg this sounds confusing but I hope someone can help. SOS