The heroine teased little Loki when she was a child, and this started an unending relationship.
The heroine is powerful, with high magic power comparable to the Scarlet Witch, and is not weak in melee combat, but she is only there to help protect Loki.
The heroine had great ideals when she was a child, and dreamed of becoming a wise queen. "I will be queen, not queen, everything in the world is my people. I will treat everyone compassionately, protect you from those who do not listen to the teachings, and punish those who make mistakes." Later, she met Loki, got to know each other, and fell in love, emmm... You know.