Demon Blood: Seraph of the end (fanfiction)

INTRO: Yuu's eyes gleam red and his horns shine red and black in the black of night. What is Yuu? And why is he with the vampires? Mika's black and green cape gently sway behind him as his silver sword hangs at his waist. Why is Mika with the humans? How will they find each other? Stay together? And will they try to...