
I don't think Mitsuharu will let Satoko stop the wedding. She had already expressed it many times that she doesn't want to marry him and that she is in love with Shinpei. But Mitsuharu already maneuvered the gears to get all Satoko's weaknesses. He made sure that Satoko's father wouldn't be imprisoned immediately (wc will absolutely lead to the downfall of the Kirigaya house) unless they are wed, and he also said that if Satoko chose not to marry him, he will have Shinpei executed. Shinpei may be strong and monstrous but he is human, he can die. Satoko had already seen that and she prolly don't want that to happen again. It also doesn't help that Shinpei came to the conclusion that he needs to get rid of every possible person that could take Satoko away from him in order for them to be together, thus breaking their promise (wc I think Satoko didn't anticipate at all and that shook her). Every odd is against her right now and she doesn't have anything with her to tackle it.
Mitsuharu is nice and all, but the fact remains that he never listened to Satoko whenever she asked him to stop the engagement, instead, he hastened it and had a wedding arranged immediately. The only one who can truly have a say in this situation is Mitsuharu. His intentions can be considered good, hence he is "nice." He loves Satoko and prolly wants to keep her safe and protected for the rest of her life. I also think that one of the reasons he doesn't support Satoko and Shinpei is because of the possibility that Satoko may die sooner if she stays with Shinpei. The guy is practically a national level criminal with his recent killings and that would definitely lead Satoko's life in a constant pattern of running away because there's no way a government will just let a man like Shinpei live freely. He obviously doesn't want that to happen to her but then again, that's not what Satoko wants!
Why is Satoko all silent and being like a victim??
Mitsuharu or whatever his name is pretty much love her at this point and will oblige to whatever she says . I'm sure of this. If she would just tell them to stop fighting, or tell him to stop the wedding, I think he would be accepting towards her..
But she just doesn't wanna speak for Shinpei and always act like a victim. I'm not saying that she hasn't suffered at all.. but now when she actually do have options, she chooses to remain silent af.
This is so frustrating tbh, he's just been getting beaten since last 5-6 chapters. What would it even change if he stopped killing at this point? Does she think, nobody's gonna come and kill him and her too if Shinpei stopped killing others. Her naive thinking is just so annoying.