花山（かざん）天皇が都を治め、人と鬼(妖し)が共に生きていた時代。
鬼を恐れる人々を救うべく存在している陰陽師。その中でも1、2位を争う実力をもっているのが、政府公認にして国随一の陰陽師と名高い安倍晴明（あべのせいめい）と、民間ながら晴明と互角の実力を持つといわれる葦屋道満（あしやどうまん）の2人である。
彼らの活躍により都は平和を保っているように見えた。
残酷な過去を背負い、たった１人の肉親をも殺され身寄りがなくなった主人公は、道満のもとで白拍子として身を置いていた。いつか仇を取る、ただその思いだけを糧に、日々陰陽道を精進してきた。そして好機は訪れるー。

Hanayama (Volcano) era of Emperor ruled the capital, human and demon (mysterious) were both alive.
Onmyoji that is present in order to save the people who fear the demon. Among them is to have the ability to fight the 1,2 position, the country's premier onmyoji and the famous Abe no Seimei in the official government and (Abe no Seimei), Ashiya Doman, is said to have an evenly matched strength and Seimei while the private sector (leg it is a two and Doman).
The city seemed to be keeping the peace by their success.
Shouldering the cruel past, the hero who no longer are also killed the only one of the immediate family relatives had put himself as Shirabyoshi under Doman. Someday take revenge, only to sustenance that I think only, has been vegetarian day-to-day yin and yang road. And opportunity visits over.