The Darkest Beings: The Darkest Angel.

Robb Cyril, a 17 year old orphaned boy, living with his adoptive family, discovers that he's a hybrid, a powerful hybrid of an angel and a demon. He later finds out him being a hybrid could destroy and create empires, thus causing the demon race to want him dead as they see him as a threat. But due to his promise to Rose, Robb's real mother, Mark will stop at nothing to see him safe. Robb's journey is full of love, happiness and sadness.