Kunizukushi is a demon slayer who absolutely despised the world as it is. After his family abandoned him and became a demon, his friends dying from the demon, his colleague turning their back against him, he became a demon slayer so he could seek revenge towards every single one person in the world. He was absolutely devastated and filled with contempt. He detested the world and everything in it. Thats is until he met a demon, one of the twelve demon moon who changed his entire life.