In/Spectre Vol. 2 (manga)

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.