Yaiba: Ninja Gaiden Z has a Mighty No.9 crossover costume and a collaboration with Nuiguruma Z. The upcoming film starring Shoko Nakagawa dressed in gothic lolita style clothes can merge with her teddy bear to transform into Nuiguruma.
How does any of this fit in with Yaiba: Ninja Gaiden Z? Well, Nuiguruma Z has zombies in it as enemies.
Nuiguruma Z airs in Japan on January 25, 2014. Yaiba: Ninja Gaiden Z comes out on March 4 in North America and March 6 in Japan.