Actually, i played samis route because i would rather write about sami than yumi's personal life, sami asked for it when talking badly about someone else therefore i couldn't like her from the beginning
. and i didn't finish the game because it's already incomplete as is. And bro. Multiple times Yumi was minding her own business and heard sami talking badly about her she was obviously jealous because of that one boy they both like☝️ which is quite childish of her. At least Yumi was nice to the mc whereas sami was not. Like you said you "calmed the situation down and made her stop engaging with Yumi" I however don't feel that's our responsibility, mc isn't her mediator if her talking badly about people gets her into drama then who's fault is that.