Action, Seinen, Shounen, Sci-Fi, Mecha, One Shot
Crossover one-shot between Mazinkaiser and Shin Getter Robo. It was included in Immortal Super Robot Encyclopedia (不滅のスーパーロボット大全). The manga begins with the Mazinger Z and Great Mazinger fighting against an alien machine after the Diana A and Venus A have been taken down.
Where to read
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