Kizu Utsushi Reijou no Toubou Keikaku wa, Ouji no Dekiai de Soshi Saremashita

Ruby, a villainess with the power to heal others by transferring their injuries to herself, one day realizes that she had been reincarnated.. as the villainess of the romance novels that she loved in her past life! She spends her days being used by her parents and having unhealed injuries, so she prepares to run away from her bad ending. The day she finally decides to leave the manor, her betrothed Prince Ignatz appears. He's supposed to marry the heroine of the novel, but he rains kisses all over Ruby's shocked body.