Shounen Onmyouji: Season 1

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 (もっくん?) who shows him his true potential powers after fighting a demon. Mokkun is actually Tōda (騰蛇?), see Teng (mythology), who prefers to be called Guren. He is one of the twelve shikigami called the Shinshō (神将?), who has pledged his loyalty to Seimei and is helping Masahiro to surpass his grandfather.