Kyoko's mother

Oh, hey! It turns out we really do know the name of the woman who's completely soured Kyoko's attitude toward family: Saena. Mogami Saena. It's mentioned only once, when Kyoko is recalling learning katsura-muki in chapter four; Sho's parents are discussing her. It remains to be seen whether Nakamura-sensei remembers that she gave a name. I can't wait to find out.