Odessa is the princess of Quentis, overshadowed by her half-sister Mae. She is forced into marriage with Prince Zavier of Turah by her father in order to secure trade routes and military alliances with the kingdom. Her father uses this to infiltrate Turah, find its capital city, and stop the kingdom's monsters from migrating into Quentis. As she embarks on her journey to meet the prince, she develops complex feelings for his bodyguard known as the Guardian, and finds herself torn between her attraction to him and her duties to her kingdom and her father, while also trying to save the world from monsters.