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?
Iwanaga-san used the first three 
solutions to feed them basic elements
استعملت إيواناغا-سان الحلول الثلاثة لمنحهم العناصر الأساسية
Iwanaga hat ihnen mit den ersten
drei Lösungen Bausteine geliefert,
Iwanaga ha fissato le impostazioni di base
per rendere credibile l'ultima soluzione
A Iwanaga usou as três primeiras soluções
para dar a eles elementos básicos
Чтобы люди поверили в базис
её четвертого решения,