Responses
It's because she found out her husband had been in a relationship with Kuruto's father, and that she couldn't understand. So she left.
Still she is the mother, it will be understandable that she left her husband but her son, unexplainable.
i wonder where's enishi's mother?
i mean why she doesn't want to find or take care of her own son? well i do understand that she ran away and left them bc enishi's father was a gay, but man, she's still the mother of this precious child! plus enishi's dad is already dead, she should at least be a little more responsible. poor enishi.........