Ninjutsu is an attack type in Ogre Battle: The March of the Black Queen and a skill set in the PSP version of Tactics Ogre: Let Us Cling Together, both exclusive to Ninjas and Ninja Masters. in battle.
Ogre Battle: March of the Black Queen Edit
As mentioned, Ninjutsu is a type of attack exclusive to Ninjas and Ninja Masters. A back row attack of varied element, the Ninja can execute it twice while the Ninja Master executes it once but hits all enemies.
Tactics Ogre: Let Us Cling Together (PSP) Edit
Here, Ninjutsu is a skill set exclusive to the Ninja class. Ninjutsu skills consist mostly of elemental damaging summons, ailment attacks and support.
One thing that separates Ninjutsu from every other skillset in the game is that it doesn't require any MP or TP cost to cast. All skills have a different sundry cost depending on the skill; these sundries can be bought at the General Shop.
For any skill name marked with an asterisk (*), see end of table for notes.