I don't really care about the mom's backstory or "why she's like that". Honestly I think the most realistic part of this manga is that some people are just bad parents even if unintentional. They may not hate their kids and be cartoonishly evil or physically abusive,but they are self centered and overtly traditional minded. Some people are just miserable and manipulative like that and I really appreciate how Satoko has decided to get away from her. There doesn't need to be a "deep down she loves her daughter so she will apologize" arc when realistically, she will never see the error of her ways. Just screw the whole "family is family so they'll fix things eventually" when that lady is so stuck in her ways and toxic, that even if she somehow gains a conscious and apologizes,she's done nothing but damage to her daughter. There's a parallel between her mom and Mashuu's dad,that being them both were neglectful of their kids and never listened to them. The difference is, Mashuu's dad is more open-minded and does genuinely want what's best for his son(even if wrong, he's not trying to do what he personally wants. Example: he was in no position to have Mashuu play soccer freely but he still let him try it on a condition rather than forbid him completely.) and when in "danger", tried to protect him even if it was in a wrong way. While Satoko's mom is more close minded and does what *she* sees best for her daughter, and when Satoko was in "danger",her mother looks at her last and blames her. In the last chapter, Mashuu could talk with his father whereas Satoko could not talk with her mother. While both were bad parents,Mashuu deems his dad as not a bad guy who he can forgive and have a good relationship with. Satoko does not feel the same and has every right to distance herself from her mother.