Also known as 少年陰陽師, Shonen Onmyoji, Shonen Onmyouji, The Young Spirit Master or Teenager Onmyoji.
This TV series has 26 episodes with each episode lasts for about 23 min. Its original run was from October 3, 2006 to March 13, 2007.
Shounen Onmyouji’s genres are action, demons, historical, magic and supernatural. The anime is rated PG-13, which is suitable for teens 13 or older.
Here is one of the Shounen Onmyouji videos I found and like: