(Y/n) Hitachiin is the older sister of the twins, Hikaru and Kaoru Hitachiin. She used to live in America with her father, but has come back to Japan as a student at Ouran High School. All (Y/n) really wants is to get through high school and take over her fathers business... but things don't go quite as planned when she stumbles upon an abandoned music room, and meets an annoying Shadow King. Things only get worse when she makes a bet with the Demon Lord himself. As time passes, (Y/n) learns that her life isn't to go quite as she expected when she uncovers parts of her she once knew. Will she live up to her fathers expectations, or will she follow her heart?