Niki: "You may have cucked me Sekai, but guess who they are calling
mommy, now."
Niki played the long game, lmao.
That does remind me though, this Sekai (White Dress), in particular, implied that she is only around because of Sensei:
She did suggest she hung around Ami as well:
But the point seemed to be that Sensei (and maybe Ami) are what allows her to exist.
So, if Niki does end up replacing her in their minds, it may as well be a second death.
Frankly, that might even be why Sekai hated Maya Prime so much. She may have fucked Sensei's mind up to the point he forgot about Sekai and only recalled her as "Teacher".
In other words: Sekai's existence may be at stake now, due to Niki.
I also have to wonder if Maya Prime may be in a similar situation. Only kept "alive" due to the memories of her that Ayane, Noriko, and Sensei have. Maybe even Ami, although she seems to prefer New Maya.
This also makes Sekai calling Maya "whatshername" and Pareidolia calling her "Mayo" etc, possibly an attempt at killing Maya Prime off, permanently. Even the recent Io stuff may be an attempt at this:
Perhaps New Maya is another attempt of sorts.