One day, Sierra Zikitalis recalled the memories of her previous life. It turns out that she was reincarnated as the character that is used as the stalking horse* in an 18+ otome game! To escape such a troublesome role, Sierra decides to fall in love with a man who has nothing to do with the game. With the help of a spirit, she meets a handsome black-haired guy who is just the right guy for her... but it's not long before she realizes that the man she loves has a secret that could shake the world! --- Note: Refers to the side character that is used to test the main character's love.