It's one series popping up after the other! Though, this one does seem more like a movie than a series, even if it ends without any real finality. The bad guys aren't defeated. It's not even certain if the good guys win. It's unclear what'd happen next if nothing follows.
Animation looks great. The cityscape background in particular almost looks like a photo, but in dark locales it feels like not everything is affected equally by light. The faces almost glow on their own, even if the clothes seem to just absorb all light that hits them. Also, bit strange and chunky shadows playing on the character faces.
GITS type setting works pretty well, feels like it has the same somewhat saturated color scheme as well, similar soundtrack and a similar protagonist. I start imagining how awesome it'd be if there was every any similar serial animation made in tribute/homeage to Oni, could hold traits from both series but seems like it'd have a much quicker plot. Anyway, as always: good entertainment!
-cd-