Baretara Owari! Juukon Oujo: Kono Kekkon wa, Zettai Himitsu desu

A secret that Princess Sumire of the Holy Highness Empire is desperately hiding, one that absolutely must not be exposed.. it's her "polygamous" marriage to three handsome princes! If she falls in love with even one of them.. it could mean the downfall of the entire nation?! With these complicated and charming princes, where will Princess Sumire’s love and schemes lead her..? A turbulent royal romantic comedy!