The series, set in the Heian era, Abe no Masahiro is the grandson of the great onmyōji, Abe no Seimei. Seimei, who passed his teachings on to his grandson, Masahiro who has lost his sixth sense and the ability to see spirits. Masahiro constantly feels resentful for being in his grandfather’s shadow.
Even so, one day, Masahiro meets a fox-like creature which he names Mokkun who shows him his true potential powers after fighting a demon. Mokkun is actually Tōda, who prefers to be called Guren is one of the twelve shikigami called the Shinshō, who has pledge his loyalty to Seimei and help Masahiro to surpass his grandfather.
Masahiro’s dreams to surpass his grandfather may not come easy as not only he has to convinced the other Shinshō that he is Seimei’s true successor. He must also become more powerful to stop demons that are coming from China and the other parts Japan. As well as the Underworld along with evil rival onmyōji’s from destroying Japan and keeps his promise to protect Princess Akiko of the Fujiwara clan.