Koroshiya 1: The Animation Episode 0 (2002)

Evidently made by someone who watched the first one and understood/liked nothing more than the violence as that is all this is, an excuse to show endless and bloody scenes of torture and beating. Even the animation itself is sloppy and basic. Considering the original there was a chance to make a decent psychological movie (even though Kakihara was the more interesting character). A cheap, worthless cash-in and nothing more.