"I will show no mercy to anyone who lays a hand on my family!" A world in which people are desperate to obtain the power of spirits, who possess enormous magical power and wisdom. Vilm, an abomination with black hair and black eyes, spends his days protecting the village with his spirit family. One day, he is forced to take responsibility for a decision he made and set off on a journey to the outside world... An exhilarating summoning battle fantasy in which a loner and a spirit beast sister "ultimately" change the world begins now! (Source: TO Books, translated)