The Hercules Factory is the training academy for seigi choujin. It is first shown at the beginning of the second series although many seigi choujin from the first ostensibly trained there. It is reopened when the first series's heroes are defeated by the members of d.M.p to train a force of young and vital seigi choujin in their place. The training is grueling, and to graduate each fighter must win a match against a member of the older generation of seigi choujin.

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