Important thing

This story is about two people how find a propose in life to stand together through everything that comes across them. Milla Phoenix, a bird spirit who doesn't know anything about humans, and only propose is to make sure there is peace in the world. Kazuma Yaegashi, a normal human that goes to school and help Milla out on quest to make sure peace is maintain in the world, but finds out along the way that he's a special person in many ways other than being a human boy.