Vincent thought he was a normal middle school student until a massive goat creature, called an Aspected, crashes through the window of his classroom. His mysterious teacher named Evans saves him and his class from the Aspected, and nobody is any the wiser. Evans tells Vincent that he is being hunted by Aspected because he is a Signed, a person granted powers based on the Zodiac they were born under in Western Astrology. Vincent decides to go with Evans to the school for Signed, Apsis Academy, and discovers that he is a unique Signed, born under a sign that is unknown to everyone: the 14th Zodiac.