NAME:
SATAN 
A.K.A.:
KAI SAKURAI 
AGE:
???, 17, 23
OCCUPATION:
Devil, Student, Biology Professor
The Devil has not been summoned from his Palace in Pandemonium, the capital of Hell, in a great while. In spite of it being an honest accident, he forces the unwilling Miu into an unholy contract: she prayed for the love of Shion Amamiya, and in exchange the Devil demands her soul. Upon learning that her virginity is intact, however, he decides he'd much rather have that instead.
It should be a simple thing to manipulate the affections of Miu's idol, but Shion does not respond to the Devil's Black Magick. Satan must become more involved to discover why, and to that end he assumes a human identity on Earth and enrolls in Miu's school.
However...
Over the course of his prolonged proximity to Miu, the Devil—who must deliver Shion's love to Miu—becomes unwilling to give the girl's heart to Shion...
NAME MEANING AND ORIGIN:
SATAN. “Satan” comes from the Hebrew word meaning “adversary,” and it is not a name—it’s a job description, meaning it would be more accurate to call him “The Satan.” According to the Apocrypha, Satan served God as the adversary of mankind; it was his God-given task to test the faith of humans through any means, including cruelty. He fell when he disobeyed God’s commandment to worship Adam (some accounts say Jesus), claiming himself to be superior because he was created first. Taking one-third of the Divine Host into Hell with him, Satan then became the architect of all evil.
KAI SAKURAI. “Sakurai” uses the same kanji as in Miu Sakurai. “Kai” is not an uncommon given name. Its kanji contains the meanings: “charging ahead of others; forerunner; harbinger.” The radicals which make up this kanji are “demon” (oni) and “many/volume” (to). The semantic origins of “Kai” might be considered to be “voluminous demon,” though at any rate there is an irrefutable demonic implication.