Satou did nothing wrong. Satou x Shio for life.
In a way she really did nothing wrong. The way she is depicted it is made for her to be the best person for Shio to be with. The options are:
- An abusive father
-A unstable mother
-A brother who is bandaged up sleeping on couches
-A teenage boy with a creepy obsession over her
- The pretty high school girl who gives her a nice apartment to live in and constantly shown with flowers in her background
Also iirc most of Sato's violent scenes are taken care of offscreen except Shoko which is supposed to be the first true mistake she made.