One day, a bright and tomboyish girl, Miya, accidentally gets acquainted with Crown Prince Harold of the Kingdom of Cerulean, and without telling him, puts a ring on Miya's left ring finger and leaves. Strangely, because of her ring, which does not come off no matter what she does, she unexpectedly gets involved in a family feud in a foreign country...
The story unfolds one after another with a sense of speed as if you were on a roller coaster, and the gorgeous screens that do not fade even now are the classics of shoujo manga.