Seraph Of The Kyoki (Owari No Seraph/Seraph of the End fanfic) [M x Kyoki x Yu]

Everybody knows the Japanese Demon Imperial army, everybody knows about the virus that had spread around the world killing innocent humans above the age of thirteen. Humanity had fallen, vampires had rised, demons had roamed it was a compete disaster. Without a cursed weapon, or even some sort of gear, no human would stand a chance against vampires. None except one.
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Hijōshikina senshi wa guntai o doragonzu
非常識な戦士は軍隊をドラゴンズ
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A.K.A. Insane Warrior Dragons Army
An army nobody has ever seen before, so skilled you'll probably end up shitting your pants. If your alive to do that anyways. They take challenges, they take impossible as possible!They will fight you with or without weapons and they'll still be a handful!
"Baka! You think we'll run away from stupid bats like you?! Who do you think you are?!"
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It was destiny,
it was bloodlust,
it was Kyoki!
Insanity!
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How will Mikaela Hyakuya react when he finds out, Yu isn't the only family he has left?
"Beats me..."