This wasn't Wakamatsu's best. The subject (an exploration of the lineage of a serial rapist) is right up Wakamatsu's alley, but Abnormal Blood goes for a somewhat dramatic and narrative approach. Personally I prefer it when he takes a more experimental route, because that's where Wakamatsu's real strength lies.
Abnormal Blood is part of a trilogy, of which I haven't seen the other parts. Maybe things feel more like a whole after seeing the remaining entries, but as a stand-alone film it felt a bit aimless and disjointed. It's also quite short considering the scope of the undertaking, at just 75 minutes.
The usual switches between color and black and white are nice enough, Wakamatsu's camera work is interesting and even though it's a more narrative -focused film, the film still feels relatively vibrant and emotional. The ending is pretty cool, but not enough to redeem the entire film. This one is for Wakamatsu completists.