Actually, after bit of cool headed thinking, unless there's some gigabrain plot development, or some SERIOUS repercussions for Mimi, I think I'll drop reading this. There will be no point in going further, if such a 'family dynamics centric' manga won't address the SHEER FUCKING TRAUMA of having a daughter/sister/friend/classmate/whatever MURDERED. This ain't some fucking Higurashi or shit. Shouta will have no excuses either. He, together with us readers, could delude himself that previous victims were 'deserving' of being turned into fodder. Rapists, murderers, child abusers etc. Here, it's not an option.
So, short of
or something equally drastic I am not seeing a way for this story to keep integrity. No can do, sir.