Shattered at midnight

Cassiel, archangel of sadness and solitude and of Saturday, watches the time strike midnight every day of the week before losing himself to his ill mind. Filled with pain and longing, he sees the world through shattered eyes. In his depressed state, he can't silence his spinning head as he's left on his own among the mere humans on Earth. With the memories of his home in heaven, he's becoming the lost soul who needs saving.
His hero comes in the form of a misunderstood demon and king of hell, Lucifer, who's appearance is the opposite of what's believed by humanity. With a kind-hearted mentality and caring personality, he promises his fallen brother to light the life back in his soul. Even if that means he has to walk Cassiel's hell with him, Lucifer is prepared to go beyond limits in order to safe the life of his little angel.