Curse of the Undead: Yoma (1989)
Director: Takashi Anno
Rating: Three of Ten Stars
"Curse of the Undead: Yoma" is the tale of a ninja who undertakes a quest to slay a childhood friend gone bad. Along the way, he has a number of inexplicable encounters, including one that's an odd, unexplained time-warp (I think).
Like the header says, the animation is nice, there are some interesting plot elements, but those plot elements are just floating out there with no real thread to tie them together.
The more Japanese cartoons I watch, the more obvious it becomes that Sturgeon's Law is just as universal as gravity.
If you want a video that makes you think (even if thinking involves going 'Huh? Did I miss something?') then I suppose "Yoma" might be worth checking out. Otherwise, I think your money and time can be better spent elsewhere.