After a long, frigid night, Princess Rosemary and her companions have finally destroyed the demon lord once and for all. Triumphant battles are often followed by sorrow and goodbyes, but Rosemary must shake off this melancholy and tackle her ultimate goal: become Sir Leonhart’s bride! Now that they have confirmed their love for one another, the path to marriage should be a piece of cake...except nothing is simple when the king is involved. Even after all her accomplishments, Rosemary will not be permitted to marry her beloved unless she completes one final task—some reward that is! But our princess has never been one to balk in the face of adversity. She’s skipped every route, healed the hearts of Hidden World’s suitor characters, and now it’s finally time for Rosemary to raise the love flag that unlocks her happy ending!

The adorable shrine maiden Fuzuki Kanon has at last been summoned, and she brings with her hope that the demon lord will finally be eradicated. However, when agents of Lapter sneak into the castle in an attempted assassination, the sealing stone breaks! And since Rosemary is the closest person to the stone when it happens, she becomes the prime suspect for the demon lord’s possessed vessel. Meanwhile, Nevel begins their counterattack on Lapter, shattering the peace that the world has enjoyed for so long. To make matters worse, Sir Leonhart has grown distant, occupied by his knightly duties. Countering Lapter’s skullduggery, pinning down the demon lord, and getting through to Sir Leonhart—can Rosemary resolve all these issues before she’s married off to another country’s prince?

After overcoming Nevel’s harrowing cold, Lapter’s spies, and an unexpected betrayal, Princess Rosemary von Velfalt successfully recovers the stone containing the demon lord and returns home to face her father. Since her accomplishments have proven her worth, the king fulfills his promise and offers her the right to choose her own partner...but gives her only six months to seal the deal! Now comes possibly the biggest hurdle of her life—winning Sir Leonhart’s heart. On top of that, there’s the problem of the demon lord in the stone, and only Hidden World’s heroine, the shrine maiden, has the power to truly remove this evil from the world. With the summoning of the shrine maiden imminent, can Rosemary permanently break her flag for arranged marriage in a mere half year’s time? Or will someone else steal away Sir Leonhart, along with her freedom?

After an accident, a modern careerist is reborn as Princess Rosemary Von Velfalt. She soon realizes that her new life is identical to that of a rival character in an otome game that she’d once played to “100%” completion. Luxury and magic abound in the Kingdom of Nevel, alongside a collection of attractive men. However, beneath the suitors' dazzling faces lie awful personalities: masochists, necrophiles, and perverts, oh my! But it’s not all bad news—the side characters are perfect, and Rosemary has fallen for the captain of the royal guard. Since the game offers no true route to happiness, Rosemary decides to forge her own path; to avoid marriage with the suitors, she'll have to skip their story routes and fix their deviance. She’ll navigate palace and marriage politics, kidnappings, and the threat of war, all while contending with a world that’s drifting further from the game she remembers. “100%” game completion isn’t all it’s cracked up to be—sometimes, “0%” is the route to a dream life!