月光仮面
"Kekko Kamen" is a parody of "Gekko Kamen". It was originally a joke that Nagai sent to his editor expecting him to reject it. His editor, however, loved the idea and that started "Kekko Kamen". Even the name of the main antagonist is a parody: in "Gekko Kamen" it is while in "Kekko Kamen" it is . The theme song for the "Kekko Kamen" character uses the same lyrics for the theme song to "Moonlight Mask", but with changes.