This is a story about a little girl, who is a demon (that doesn't know she is a demon), discovered she doesn't have magic and can heal others.
You see, in this world, healing magic can only be cast or possessed by those who are pure and kind. While, demons are known for their evil minds are destructive dark magic.
Yet, she, who is a demon can do such a thing. The elves, who discovered this, doubted her and locked her away in the dungeon. Until one day, she proved herself by saving the deceased who had just died from a battle between the humans. She was recognized and lived in the elves' territory.
Years later, she stumbled across a small battle between a mysterious knight and a swordsman. When the knight defeated the swordsmen, he ran away in fear. Then, the knight saw her, and they gestured for her to be closer. She did, and they spoke to each other for a moment. Afterwards, the knight leaned out their palm, presented a green crystal, and said...
"Will you be... the knight that heals the Nature?"