Suddenly informed that she's a princess, Guilia can't stop shaking with anxiety. She's taken to the Kingdom of Hellenia, where she immediately finds herself pursued for marriage by a political rival. On top of everything, Toby, a man she's always had feelings for, has just arrived in Hellenia. But she can't let him realize the love she has for him, because she's convinced he only thinks of her as a little sister. The moment he arrives, however, he kisses her with undeniable passion! But if he gets close to her and appears to be a romantic rival, will his life be in danger? Guilia is shaken. How will she navigate her precarious new life as royalty?