The Daily Life of a demon lord

The man was born from a demon and human, and was chosen to become the demon King. They didn't even use the last demon King's son! They overthrew him and made Yui the new demon King after the previous one went into retirement. What is this?! Yui was just minding his own business in the village of terror just to be dragged to become a king? How does Yui, known to be a peaceful man handle the duties of a demon King?