I Don't Need a Prince.

Synopsis

Rosa Kreutzer is a selfish marquise. On her way home from a play with Prince Alex, she is kicked by a horse and injured. However, Rosa realizes something important on the spur of the moment. This is the world of the manga she loved in her previous life, and she has been reincarnated as a minor villainess who gets poisoned! In her previous life, she died of overwork as a corporate slave, and in this life, she is a villainess slated to be poisoned to death. Since she has been born to be a very rich young lady, Rosa decides to avoid poisoning and live freely...? (Source: Kadokawa, translated)