Also known as 無限の住人 or Mugen no Juunin.
This TV series has 13 episodes with each episode lasts for about 24 min. Its original run was from July 14, 2008 to December 29, 2008.
Blade of the Immortal’s genres are adventure, historical, samurai and supernatural. Since it contains violence and profanity, it is rated R – 17+.
Here is one of the Blade of the Immortal videos I found and like: