EX FACTOR Kotoko investigates the mysterious death of former idol Karin Nanase, who now terrorizes the sleepy town of Makurazaka as ``Steel Lady Nanase.`` But with Kurō missing and the threat of the Steel Lady potentially causing harm to the Makurazaka's citizens, Kotoko is left with no choice but to team-up with Kurō's ex-girlfriend, Saki. And later, as the Steel Lady strikes again, the origins of Kuro's bizarre powers are revealed.