Aileen Lauren Dautriche's life changes forever on the day her engagement with the crown prince Cedric Jeanne Elmir is nullified so he can be together with Lilia Rainworth. The event triggers Aileen's memories from her past life—she has been reincarnated in an otome game as the villainess, who is destined to die in the final act. To prevent her predetermined demise, Aileen has only one option: to court the game's last boss, Claude Jeanne Elmir—the proclaimed "Demon King" and Cedric's half-brother—and marry him. However, it is easier said than done, as Claude distrusts her intentions. Instead of giving up, Aileen adamantly tries to win his heart by helping Claude fulfill his wish: to build peace between humankind and demonic beasts. But time is running out, and it is up to Aileen to change the course of not only her tragic ending but Claude's as well.

The beginning of Light Magic and the Hero, an otome RPG, unfolds fairly normally: the heroine, Alicia Ehnleit, meets her three love interests one after another and then inevitably comes face-to-face with the villainess. Yumiella Dolkness may be of noble descent, but her dark hair and rare dark-type magic—both associated with the Demon Lord—spark fear in anyone who sees her. When she is five years old, Yumiella regains memories of her previous life in modern Japan, also realizing that her fate is to become the hidden boss that appears after Alicia and her suitors defeat the Demon Lord. Yumiella refuses to live as the game dictates and, as she prefers the game's fantasy elements over its romance, she decides to cultivate her magical skills and level up in secret. However, everything falls apart on the day of the Royal Academy's entrance ceremony. Yumiella's powers are measured at level 99—something thought impossible even for the royal knights, let alone a 15-year-old girl. With the royal family requesting her help, and everyone else insisting that she prove her strength, Yumiella realizes that her dream of a quiet life is no longer an option.

Before they met Catarina Claes, each of her close friends struggled with their personal conflicts. But with a bright smile and a helping hand, the warmth of Catarina's friendship began to melt away the moments of their lonesome darkness.

Rei Oohashi is a burned-out office worker by day but otome game heroine Rae Taylor by night. After her long workdays, Rei immerses herself in the world of her favorite dating sim, Revolution, as a student at Bauer Kingdom's prestigious Royal Academy. Instead of focusing on the male love interests, Rei obsesses over the romantic rival: the game's villainess, Claire François. One evening, however, Rei's exhaustion catches up with her and she passes away. When Rei opens her eyes again, she finds herself reincarnated as Rae and in the presence of her beloved Claire. Given this miraculous opportunity, she wastes no time declaring her love for the golden-haired villainess and her endearing attempts at bullying. Winning Claire's heart is no easy feat, especially as the game persistently throws the three male leads at Rae—but she has no intention of allowing the dating sim logic to come between her and the one she truly loves.