Elemental

Spirits (精霊), like Demons and Angels, are supernatural life-forms that reside in the spiritual world. They typically possess no ego, but those that do are classified high-ranking spirits. They are embodiments of the natural elements, namely: Earth, Sky, Wind, Water and Fire, respectively. There are spirits of Light as well, being liked by one is a sign that the individual has the qualifications to be a hero.

Just like most spiritual beings, spirits can interact with the physical world through a vessel. They hold a racial advantage to demons but are inferior to angels.

Trivia

 * Despite having racial advantage to demons, they have yet to win a single fight against demons in story. In fact, all spirit VS demon battles happened in the story ended in the spirit's instant defeat, because they were matched against ridiculously strong Primordial demons.