I understand from the comments that you all want him to be violent and punish them...oh he does..I don’t remember the details since it’s been a while since I read the novel but instead of a quick punishment like a slap in the face or a punch or something Kudou is the type to make their lives a living hell so make no mistake he wouldn’t let them go that easily but in that moment he saw his fiancé in a terrible condition he did not have the energy nor did he really care about them because her life was more important to him at that time!! You can stop commenting that he didn’t do enough now!!
https://www.novelupdates.com/series/watashi-no-shiawase-na-kekkon/
It’s dropped though I think
What a horrible mother and sister.....they are so nasty.....they might be pretty but they have a ugly heart...the mother seems to think she only has one daughter and the sister thinks the world revolves around her...ugh bitches