Hakushaku Reijou wa Yandere Dannasama to Ateuma Scenario wo Kaihi suru!!

One day, Sierra Digitalis recalls her memories from her past life. She discovers that she was a dull office lady reincarnated as a "stalker character in an 18+ otome game"! To escape the scenario, she uses the power of a spirit to meet a handsome man unrelated to the game, and they fall in love..or so she thought, but it turns out that the man she loves has a future as the "King of Impurity" who will destroy the world..!? (Source: Kodansha, translated)