Lupin the IIIrd Chikemuri no Ishikawa Goemon

Goemon takes the position as a bodyguard for a yakuza boss. He however failed to protect the boss after a brutal assassin named Hawk successfully killed the boss. This leads Goemon to not only go on a hunt to get even with Hawk, but also go through a brutal training session that will help his swordsmanship. (Source: ANN)