Plastic Mask (プラスチック製のマスク, Purasuchikku-Sei No Masuku) is an alpha league hero who is currently under employment by the planetary defense agency. Nobody is aware who the true identity of the mysterious plastic mask is. He is a mysterious hero who is assumed to be a natural-type hero who possesses a strange affinity with a plastic tengu mask, which grants him profound supernatural powers whenever he wears it, though no others are actually aware of the nature of his powers within the planetary defense agency.