Mazinger Z tai Kekko Kamen (マジンガーZ対けっこう仮面) or Mazinger Z vs Kekko Kamen is a one-shot Japanese comic book written and drawn by Takeshi Okano based on the original work of Japanese cartoonist Go Nagai. The cartoon, released as a homage for Nagai, is a crossover between Mazinger Z and Kekko Kamen. It was originally published in Shueisha's publication Grand Jump #4 of 2013, released for sale on 2013-01-16 (cover date #2013-02-06). It hasn't been collected anywhere else.