Feat is here and is performed by Toushirou Hijikata from Gintama. Also, here are the manga scans, which proves that the feat is canon.

(Thanks to XxZetsuxX for providing with the feat scans)

Context[]

Hijikata is to be shot at with a gun but he lunges forward and cuts it with his sword.

Calculations[]

Distances[]

Scaling Hijikata:

• Height = 290 px = 1.77 m
• Sword length = 124.454811076 px = 0.75960350208 m

Initial distance between bullet and Hijikata's sword:

• Hijikata's sword = 176.071008403 px = 0.75960350208 m
• Distance between bullet and the sword = 264.068173016 px = 1.13923984891

Distance covered by Hijikata's sword (found by overlapping):

• Sword length = 182.068668364 px = 0.75960350208 m
• Distance travelled by the sword = 254.636996526 px = 1.06236375571 m

Final Speed[]

The speed of the projectile = 381 m/s (Beretta M9 muzzle velocity) - I chose it because the bullet had a mach cone which would require mid-transonic speeds at minimum, this velocity is close to it.

• Distance travelled by projectile = 1.13923984891-1.06236375571 = 0.0768760932 m
• Distance travelled by the sword = 1.06236375571 m

Speed = 1.06236375571*381/0.0768760932 = 5265.1035462 m/s (Hypersonic+)