The main character had reincarnated to the world of “The Ring of Lapis Lazuli”, her favorite otome game―but as the villainess, Tiara Rose. The story progresses according to the original otome game, and her engagement with Prince Hartknights, the crown prince from Lapis Lazuli, breaks off. However, a sweet and surprising plot twist occurs when Aquasteed, the crown prince of the neighboring country Marinforest, suddenly appears to propose a marriage to her.