So... is Onmyouji finished or not?
NO, it is not finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Onmyouji follows the adventures of Abe no Seimei, a brilliant and enigmatic onmyouji (a kind of diviner or sorcerer), as he navigates the treacherous world of the Heian era.
He forges an unlikely bond with Minamoto no Hiromasa, a nobleman known for his honest and forthright nature.
Together, Seimei and Hiromasa investigate mysterious incidents plaguing the capital, which often involve supernatural forces like demons and curses.
Their contrasting personalities and skills complement each other as they work to protect the city and uncover the truth behind these unsettling events.
The anime explores themes of friendship, the balance between the human and spiritual realms, and the complexities of ancient Japanese magic and folklore.