Sora no Kakera

Abe Tokiharu, whose ancestor was the great onmyoji Abe no Seimei, is a half-baked onmyoji. He is often compared to his cousin Yasuchika, who is highly trusted at court and nicknamed "Sashikamiko," and is the target of gossip every day. However, with the appearance of Seimei, Tokiharu awakens to his hidden powers, and this is a Heian period horror picture scroll tale that depicts his growth.

(Source: Gakken Plus, translated)

Note: Includes two extra chapters.