Some of it makes sense, though. Amamiya's, however, doesn't (I haven't read the whole thing, so I don't know what's up). Is she schizophrenic pyschopath? Are they actually twins? What's her motivation? We know next to nothing. At least with Katori, it's just shown she's desperate and determined (albeit reckless). Amamiya? You have to ask how the cop didn't arrest her yet...