The plot of AVN: Aliens vs Ninjas:
Once upon a time in Japan, there was a band of great Ninja warriors led by Yamata called Iga Ninja. One day they witness a flash in the sky and a roaring giant ball of fire crashes into the distant forest. The warriors rush into the deep woods in an attempt to identify the mysterious fireball. There, instead of finding predictable enemies, they are stunned to face never-seen-before creatures with claws and fangs, the aliens! The hungry brutal aliens start to savage and feast on the Ninja warriors, leaving only a few to survive. Yamata and his warriors swear to avenge their comrades' deaths and risk their lives to challenge the aliens. However, none of the Ninja weapons, neither their swords nor their throwing stars, has any affect on the alien warriors. Now the Japanese greatest Iga Ninja face the biggest challenge ever!

This movie stars Masanori Mimoto, Shuji Kashiwabara, Donpei Tsuchihira, Mika Hiji, Yuki Ogoe and Ben Hiura. No approved release date yet for this movie.

It is kinda rare to see an alien monster on a movie flick (of course, outside the Kaiju genres). Maybe they felt that zombies are kinda overrated and overly used when it comes to gore movies.