Blood Bride : THE SCRIPT vol.1

There were two brothers, both as different as night and day. One was a vampire, born of their father's cursed bloodline, while the other was a mortal, free from the burden of eternal life.
The vampire brother, his name was Castellan, was always careless and impulsive. He struggled with the dark urges that came with his vampirism, and often found himself at odds with his humanity. His mortal brother, on the other hand, was moody and distant. He was the light to Castellan's darkness and the one person who could bring him back from the brink of his monstrous nature.
Their mother had died giving birth to them, and their father, the very first vampire to ever walk the earth, had disappeared soon after he used forbidden magic to give castellan his vampiric powers. They were raised by their butler, a kind old man who had been with their family for generations. He taught them everything they needed to know about the world and instilled in them a sense of morality and responsibility.
As they grew older, the brothers entered high school, where they met a girl named Dai. She was beautiful, smart, and funny, with red hair wavy hair with ocean blue eyes and they both quickly fell in love with her.
As their love triangle played out, the brothers were forced to confront their own natures, and decide once and for all what kind of men they wanted to be. Castellan struggled to control his urges and protect Dai, while his mortal brother fought to keep her safe from the dangers of their world.