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?
Perhaps she didn't have any friends or family, 
or she suffered from a mental illness.
ربما لم يكن لديها أيّ أصدقاء أو عائلة، أو
.ربما كانت تعاني من مرض عقلي
Vielleicht hatte sie keine Familie oder Freunde
oder hatte gar ein psychisches Leiden.
Elle n’avait peut-être pas d’entourage
ou souffrait d’une maladie mentale.
Forse non aveva parenti,
Talvez ela não tivesse amigos ou família,
ou até sofresse de uma doença mental.
Возможно, у неё не было друзей и родных,
возможно, была психически больна…