Usotsuki Heika ga Watashi ni Shuuchaku Suru Riyuu

Suzuka was transported to another world at a young age and imprisoned as a snow shrine maiden, but due to her weak powers she was severely oppressed by Adolf, the king of the snow kingdom, and the people around her. One day, she reunites with her first love, Warren, who helped her when she arrived in the other world, for the first time in 10 years, and her joy is short-lived as he suddenly kisses her...! Suzuka is tossed about by her first love, who has changed since childhood, but she is drawn to him. However, the wheels of fate become more entangled as another shrine maiden, Kako, and Adolf are drawn in - a forbidden other-worldly love fantasy by "The Dropout Shrine Maiden" and "The King of the Enemy Country"!

(Source: ComicWalker, translated)