Blue Room of the Prince (王子の蒼い部屋)

Prince Karl of the Kingdom of Clause comes to the age to perform the traditional ceremony of love. The ceremony is to spend one week with a woman of his choice to prove that he is now adult.
Karl chooses Yuria, his ex-teacher that he has been holding a little torch for. At first, Yuria is confused about being chosen by her ex-pupil. But gradually, Karl’s pure love begins to change her feeling.
However, King Rudolf is also fond of Yuria.
Now the storm of love hits the Castle of Clause!