reign's manga / #Otome game(1)

[Villainess] ━━━ ━━━ The MC reincarnates into a dating sim as the adopted daughter of a Duke. Unfortunately, she plays the "villainess" which is the insanely hard route. In order to survive, she must reach 100% favourability with one of the male leads while ensuring that none of her relationships fall below 0%, or she'll die by their hand. The real FL is the missing daughter of the Duke who's arrival spells the MC's downfall.