In/Spectre Vol. 5 (Kodansha, 2017)

With the violence and the urban legend of Steel Lady Nanase only continuing to grow in power, it's up to Kotoko to put a stop to her once and for all-and quickly! Her mission is complicated by the likelihood that Kurô's sickly cousin, Rikka, is the mastermind behind it all. Kotoko gathers ""four solutions"" to destroy the truth that Rikka has brought to life, but can a lie destroy a fictional monster and create a new truth? Armed only with these imaginative solutions, Kotoko, Kurô, and Saki kick off the decisive battle with Steel Lady Nanase.