Conservation of Ninjitsu

One of my favorite entries from the terrific website tvtropes.com is the conservation of ninjutsu, which states: "In any martial arts fight, there is only a finite amount of ninjutsu available to each side in a given encounter. As a result, one Ninja is a deadly threat, but an army of them are cannon fodder." And now Japan has seen fit to put that theory to the test.



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