Kurou

Kurou is a legendary figure who has roamed the otherworld for over a century, widely known as the Sage and held in deep respect even by the Demon King. When Oda Akira sets out on a journey to uncover the truth, Kurou emerges as a mentor figure, guiding Akira to confront what lies within and offering crucial support at pivotal moments—making him an indispensable pillar in the protagonist's path of growth.