Marianne Soleil, daughter the Souleia Kingdom's Prime Minister Duke Soleil, receives the shock of a lifetime when an accidental blow to the head helps her recall her past life... as a dating sim-obsessed office worker! Marianne now finds herself living in the world of her favorite game, and as the villainous fianc?e of the game's heroine's true love, Crown Prince William, no less! Her engagement might be destined for ruin, and her future fated for banishment from the kingdom, but Marianne refuses to sit idly by... Not only is she skilled at magic and sword fighting, but she's now armed with her experience as a company wage slave from her previous life. That's when she realizes that she has the perfect solution to her problems... become an adventurer! In order to secure her future, Marianne must now balance her life as a noble and her secret identity as an adventurer, while also ignoring her fianc? William's cold treatment and her budding feelings for Balto, her mysterious new acquaintance. Will Marianne be able to juggle it all until the day her big break-up finally arrives!?