"This sexy, charming woman is the same Rosa that fell in love with me when she was sixteen?" Prince Max has to hide his shock when he's reunited with his cousin, Princess Rosa, at the airport and sees how she's changed. In order to resolve the issue of an outbreak in the vineyards of the kingdom of Niroli, Max asks Rosa to leave her work in New Zealand and come back to their country right away. But Rosa is forbidden fruit! He must not let himself fall for her. Because marriage between family members is strictly forbidden in the royal family.

Part of the Niroli Rules series (ニローリ・ルールズシリーズ), also called "The Royal House of Niroli" series, which goes as follows:

1. Itsuwari no Kamen
2. Doctor wa Prince
3. Prince to Scandal
4. Chichuukai o Wataru Kaze
5. Tsumetai Prince
6. Kokoro no Symphony
7. Yuuwaku no Perfume
8. Oujo no Unmei