Looking for the name of an anime with a guy who was so fast, he let the enemy's sword practically touch him before he reacted
So, it is Mutsu Enmei Ryuu Gaiden: Shura no Toki


  Legends tell of an invincible martial art known as Mutsu Enmei-Ryu, an unarmed style that allows the user to defeat any number of armed opponents using incredible speed and strength. This is the story of three generations of those who bear the name Mutsu, and their encounters and battles with the strongest fighters of their era.