The Duke's Only Daughter (Pre-serialization)

*Note: This is a promotional oneshot.* I reincarnated as the lowest-ranked support character in a game. Being born as the great duke's daughter wouldn't have been so bad, if... my fate hadn't been to be murdered by him on my 9th birthday! Seriously, what kind of destiny is that?! Fine then! If I can't avoid my fate, then I'll have to conquer it! "Time to become friend with the main character and knock out the Demon King!" Follow the heroine as she embarks on a great adventure to overcome her terrible fate and defeat the Demon King while she's at it!