Rose Marie has spent most of her life in the royal harem of Glenfil, as the first concubine of Crown Prince Ulysses, until one day she realizes that she can't bear to stay there any longer. But no sooner has she made that decision than she gets the order to complete the "Rite of Consummation"...! Though she's technically the most senior member of the harem after her ten years of residence, due to her age she hasn't yet been recognized as an official concubine. Once she completes this rite, though, she really will be stuck in the harem forever. Rose Marie is now scrambling around trying to find a way to get out of this duty, but Prince Ulysses won't let that happen...?! グレンフィル王国の後宮で、ユリシーズ王太子の第一側室として暮らしているローズマリー。 ある理由から側室をやめたいと思っていたけれど…そんな矢先、側室の義務である『閨の儀』を果たすよう命じられてしまって…!? 後宮歴10年の最古参にもかかわらず、年齢的な問題から正式な側室としては認められていなかったローズマリー。もし『閨の儀』を果たしてしまえば、本当に後宮から出られなくなってしまう…!回避するべくあの手この手で奮闘するローズマリーだけれど、ユリシーズはそれを許さなくて…!?