Yeah right, like that teen without a spinal cord would be able to commit murder. Only on drugs or if his mental disorders took control.
Nakumura could be able to murder someone, but that would also need another mental shift.

That speedy glimpse of part 2, you can't really understand without reading the manga. Out of that, I only want 2 scenes animated.
I wonder about one of them though, as per law it should be censored I guess (not a spoiler, rewatch the preview )

Once you're caught, the manga clearly is orders of mangnitude better than the anime. But the anime really has a catchy and nice OST. Only watch this to complement the manga and for the OST, otherwise, it's only a useless piece of shit (Nakamura Speaking)