I couldn't miss the chance to practice my drawing!
Catch and stop enemy attacks.
Shirahadori (also known as Evade) is a Level 3 Samurai job class that costs 60 ABP. It gives the character a 25% chance to completely evade an attack before normal Hit Rate calculations begin.
Evade non-ranged physical attacks.
Shirahadori (also called Blade Grasp) is reaction ability the Samurai class learns for 700 JP. This ability lets the unit avoid any physical attacks easily, including, despite its description, arrow/bolt attacks (but not abilities that ignore Evasion; this glitch was not fixed in the PSP port).
This is widely-known as a highly unbalanced ability since its success rate is equal to the amount of Bravery a character has. Therefore, if a character with 100 Bravery equips Shirahadori, s/he will evade all physical attacks that do not ignore Evasion. Interestingly, when the A.I. deals with such absolute failure rate they will change their tactics to avoid this ability, or simply do nothing. If the player limits their Bravery at 97, enemies will try to attack even with a 3% chance to hit. Thus, many players prefer to have Bravery at 97 rather than maxing it out.
Shinken Shirahadori (真剣白刃取り) means "live blade catching," a dangerous technique used to catch blades using only hands, as written in the book Classical Weaponry of Japan: Special Weapons and Tactics of the Martial Arts.