A little information about the story, and Alex 

Alexander an Angel working directly under God to carry out his holy words and mission... Basically he's an Aaron boy doing whatever God asks him to do without complaint nor questioning it. But after thousands of years without any need for divine and intervention Alex is finally given a new task to watch over the daughter of Lucifer, Charlie the Princess of Hell and her plan to rehabilitate sinners

Alex, once again never questioned or argued with God's requests he was just happy to finally have a purpose again after thousands of years and he thought it was going to be a relatively easy job just watching over the princess of hell but boy was he wrong?