The devil, he is the main villain of all things. His only goal is to capture the world, subjugation, humiliation, exposing and a lot of bad things. At the beginning of the series he shows himself as a merciless leader of the dark forces. But due to a combination of circumstances and the fall of his Kingdom in Ent Islam, he has to flee. Opening the portal, he ended up in modern Tokyo. But alas, in addition to the lofty ideas of capturing the world, subjugation, humiliation and exposure, our hero in modern Tokyo can do nothing (except a couple of abilities), so the Lord of Darkness has to push his ideas to the background and go to work in the local McDonalds. Sadao quickly adapts to life in Tokyo and finds a common language with customers and colleagues. In the modern world, it looks like an ordinary youth. But, despite his deplorable status, Sadao leaves no idea to take over the world, and now he wants to not only give revenge on Ent Isle, having restored his magical abilities, but also to enslave Japan.