Haizao

Since time immemorial, the magical beings known as angels and demons have opposed each other, waging war on each others homes and upon the world of Ayther. But something terrible is coming, something that threatens to consume all three worlds and leave nothing in its wake.
Kir had a rough life ahead of him, even before he was born.
His mother made a deal with a devil to bear him in exchange for power, a decision that resulted in her exile. Then, in exchange for a new life, she gave Kir to a witch.
The witch turned out to be a rather good parent though, so Kir got raised in a kind and loving home.
Everything changed on his seventeenth birthday, when, not only did he grow wings, but they were angel wings! 
Now his dearly-absent father has come to collect him, and in the custody battle between a witch and the Devil of Heresy, Kir isn't sure who will come out on top, but he knows he wants to keep his family safe.
Thankfully, however, his father's willingness to strike a deal gives Kir some time to prepare for what's to come, and to learn more about himself.
He just has to make it through life at a magical academy with a succubus, avoid dying, and survive to find his mother.

It's a lot to handle for a quiet, brooding angel boy.
Fortunately, Kir has his own secret: this isn't his first go at life.

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Special thanks to ExQuartz_Roachina for help with the cover!

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Content Advisory: Sex of the pansexual variety (lots of it after chapter 50)
Adult-Oriented chapters will be marked with * at both ends of the title.
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The Demon Lord Is An Angel

It was all Kir could do to stop himself from saying something as he heard the voice again.

Kir held his head with one hand. Was he going crazy? He felt tense all the way down to his tail...

"Twenty-eight is a magic number..." he repeated.

"What?" Kordia's ears and tails twitched in confusion.

"It's... consistent numbers arising from fractional calculus for tendencies of orbital stabilities in atomic physics..." half the words he said had no analogue in Common, and so to her, it must have sounded like he spoke jibberish with the mix of Japanese and English needed to make that sentence.

"Stabilities..." Kordia pondered. "You mean like casting circles? But stabilities for those are only two, eight, and twenty..."

Magic By The Numbers