When Meldy regains memories of her past life, she realizes she has been reincarnated as a background mob character in an otome game who is brutally murdered at the very beginning, a corpse role young lady. Desperate to avoid her gruesome fate, she discovers the key to her survival is preventing the game's mastermind, First Prince Jake, from obtaining the Demon Summoning Book, the event that triggers his dark descent. Prince Jake is perfect, but his very perfection leaves him isolated and profoundly bored, making him susceptible to falling into darkness.

Meldy throws every obstacle she can think of in Jake's path to keep him away from the cursed book. However, her interference backfires spectacularly. Instead of being repelled, the prince becomes fascinated by this unusual girl who dares to meddle with his plans. He proposes a deal, naming her his play partner in exchange for his cooperation. Now stuck in a dangerously close and surprisingly sweet relationship with the very person who is supposed to kill her, Meldy finds herself navigating a forbidden and obsessive yandere love route she never expected.

The story takes place within the confines of this otome game world, focusing on the tense and alluring dynamic between the desperate Meldy and the increasingly possessive Jake. As she struggles to keep him from turning evil, the initially disinterested prince begins to show genuine, albeit twisted, affection, becoming deeply attached to the one person who treats him as a normal human rather than a perfect prince or a future villain. A notable arc involves Meldy's kind nature causing her to prioritize Jake's well-being over her own survival plans, leading to misunderstandings and moments where her genuine talents as the corpse role unexpectedly come into play, much to Jakes dismay. What begins as a survival strategy gradually transforms into a sweet yet hazardous romance between two people experiencing their first real feelings for another person.