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?
If Nanase Karin's alive, 
what the heck is Steel Lady Nanase?
إن كانت ناناسي كارين حيّة، فماذا تكون سيدة الفولاذ ناناسي؟
Wenn Nanase Karin noch lebt, wer soll
dann die stählerne Dame Nanase sein?
Si elle est vivante,
qui est la fille d’acier ?
Se Karin Nanase è viva, cosa diamine è Nanase d'Acciaio?
Se Karin Nanase estiver mesmo viva,
o que é a Mulher de Aço Nanase?
Если Карин Нанасэ жива,
то кто же такая Стальная?..