Reo Mikage or well known as Reo is a mythical lion demon, one of the most arrogant, cocky, sly, and powerful among the rest in Demon species. All Reo's lives, he is spend the most of time mingle with humans in his humans form. From that, Reo can studying human life developments who is so dynamic along with changes over time to time. Because of Reo's high ambition and his curiosity about human uniqueness, it feels like he wants to dominate human race for expanding his territory greedily.