Sovereign and HeartburnKunshu-sama ni Munayake; 君主様に胸やけ; 주군, 속이 쓰립니다; Принце, мене від вас нудить!; My Aggravating Sovereign; 混世皇太子只对我恋爱脑; 令人頭痛的君主大人; ฝ่าบาทเพคะ หม่อมฉันใจเจ็บ; Jugun, Sogi Sseurimnida; Vossa Alteza Me Enlouquece!

Arias world is thrown into chaos when Crown Prince Julius, the brilliant but insufferable royal shes sworn to protect as Captain of his Guard, announces her as his future bride. Stunned, Aria confronts him, and Julius offers a way out: if she can defeat him in any competition before the wedding in six months, hell cancel the engagement. But with Julius unmatched skills, winning wont be easy. Can Aria outsmart the talented prince and reclaim her life?