It's weird.
The beginning is strange: they show you a few seconds of some catastrophe in the city, then switched to "good and happy old days" which seem to span weeks, if not months, but are being fit into 3 minutes, and then return to the catastrophe. This felt disjointed. I would have dropped the first few seconds, and then made the "good and happy old days" longer, at least 5 minutes, and show a bit more "flesh" of the 2 girls' relationships, so that viewers would care, when 1 of them dies.
Then a guy appears, who is probably one of the edgiest characters I can remember. Don't get me wrong, my own stories had edgy characters, there is nothing wrong with that, but... I could not get a read on this one. Like, is he just crazy or battle crazy? Is there anything besides fighting inside his brain? I mean, even Zaraki Kenpachi from Bleach felt more fleshed-out when he was first introduced.
To me it feels like this episode was built in a way to specifically cause "wow!" and "huh?" effects. The fights, did look nice, and I am of an opinion, that it's better to have a gripping start, but something tells me, this was used a cheap trick. Like it showed you stuff to make you want more, but next episodes will either have exactly the same approach and thus will become stale too quickly or it will have nothing even close to it, which will result in disappointment.
I will give this one a chance, but I don't have much hope for it so far.