Yotsuba only first mention this on ch 6x.
Prior to this Ichika is a caring sister who hide her feeling for Miku, worked herself to death to provide for her family.
And now all of a sudden she doesn't give a fuck about them anymore?
Face it, Ichika only got turn into antagonist cause Negi need someone to create tension and drama now that Nino no longer fit this role.>inb4 you accuse me of being a snekfag or whatever meme buzzword you think of,
No I am not even defending her,
I just think it is shitty writing to turn into a convincing plot device.
If this can happen to Ichika your favourite quint will probably be next.