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?
This logic about why Steel 
Lady Nanase was needed...
...هذا المنطق عن سبب الحاجة لسيدة الفولاذ ناناسي
Der Grund, warum es die stählerne
Dame Nanase brauchte,
La lógica de la necesidad
de la Dama de Acero
La lógica de la necesidad
de la Dama de Acero
Pourquoi Nanase est-elle nécessaire ?
Il motivo per cui era necessario creare Nanase d'Acciaio...
A lógica por trás da necessidade
da Mulher de Aço Nanase...
«Зачем нужна Стальная дева»?