Kotoko came up with three solutions, but they all got shot down. Kuro keeps trying to grasp the future where they can defeat Steel Lady Nanase, but Rikka made it disappear once again. But Kotoko wasn’t done yet. Steel Lady Nanase is not a ghost. What is Kotoko’s 4th solution that may finally put an end to Steel Lady Nanase’s existence once and for all?
Why did Nanase Karin let the steel beams 
hit her without any signs of struggle?
لماذا تركت ناناسي كارين الدعامة
الفولاذية تصيبها دون أيّ علامة عن المقاومة؟
Warum starb Nanase Karin unter den Stahlträgern,
ohne sich zur Wehr gesetzt zu haben?
¿Por qué Karin Nanase dejó
¿Por qué Karin Nanase dejó
Pourquoi Karin Nanase
a reçu la poutre
Perché Karin Nanase si è lasciata colpire frontalmente
Por que Karin Nanase deixou a barra
de aço atingi-la sem nenhuma reação?
Почему Карин Нанасэ получила удар в лоб
и даже не пыталась увернуться?