I Woke Up as a Maid in a Romance Novel and His Royal Highness is Madly in Love With Me

Literary editor Erina suddenly finds herself stuck in another world: the world of famed romance novelist Haru Yayoi's most recent book, that is. Yayoi gives Erina an absurd order -- enter the story and spice it up! That's how Erina finds herself turned into Ellie, the lady in waiting to the duchess. And somehow, she also ends up needing to collect the ingredients to make the legendary "Blue Forbidden Fruit." The fate of the kingdom depends on it! Unbeknownst to Erina, Yayoi's younger brother Kiito follows her into the story, and the two meet there for the first time... A fantasy story about finding one's true love within the pages of an unfolding romance novel!

(Source: MangaPlaza)