The Collection of Elves

This is an era where spiritual energy is revived and diverse worlds are intertwined and mixed. Monsters, monsters, and strange elves are wreaking havoc in the city, causing chaos everywhere. And human beings have also begun to awaken to various strange abilities, including supernatural powers, magic, qigong, witchcraft... The protagonist is a half-demon, but he has awakened his superpowers, subdued the Kati dog, and inherited a book on collecting demons from ancient times. "What? Use Poké Balls to collect monsters?" "Are you serious?!!"