The reincarnator also played the Otome game, so she did and behaved as she was going to to avoid her fate in the game since the body she reincarnated was also a villainess, but alas, it didn't go the way she expected, and in the end, the shitty fl won, coz she cheated coz she also reincarnated, because she bought love potions.
Due to her shock that things didn't go her way, she collapsed, and the original soul of the villainess body came back since she didn't die in the first place, just a lost soul who slept for years. Now that she's back, she promised to do the things the reincarnator wants, and she got her revenge with the shitty fl in the Otome game.
It ended so well, and this manga is also a fantasy because she married the Devil King.
I forgot the title huhuhu the manga is still on going however the novel is complete already.
I think it's "the one within the villainess"
I was gonna comment the same thing you just wrote
I read something similar to this, but its difference is that the original body/soul came back to her original body after the reincarnator collapsed from the shock. ╥﹏╥