Have you tried using AD&D 2nd Edition Combat Rules? This is the easiest 
system I've come across.

	Huh?  D&D combat (in any form) is simple attrition.  You hit your 
opponent or you don't, and the last person with positive hit points is 
the winner.  There's no real variety, and any time TSR tries to come up 
with rules for "special moves" they just bog the system down.  That 
wouldn't really work in an Anime game; it's the wrong tone.
	I would suggest a Palladium-based strike/parry system, combined 
with a TORG-based damage system.  You could even use TORG trick, taunt, 
and maneuver rules, all of which are very Ranma-esque.
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rmckenzi@euclid.ucsd.edu : The White-Robed Mathematician