Three Sons & Flower Moon

Princess Muri doesn't want to get married... but it's her duty. That is, it's her duty until she's summoned to the Entreaty Stone and meets a relic of the realm before. When the woman wakes the magic inside Muri, the princess also receives a gift of three elemental sorcerers, and they have some shocking news for the princess. Now the four must work together to save Muri's father from the King of the North.