Kamen Rider: Armonsters (仮面ライダー：アーモンスター,Kamen Raidā: Āmonsutā?) is the first Codename: Z Rider series of Kamen Rider series. The Kamen Rider: Armonsters is very lighter tone than darker tone though not used violences. Oddly enough, by the fifth episode, it has sexual and nudity mature, so it makes combining lighter tone and sexual mature recently.
The mysterious meteorite with the greenish slime over the thousand years ago since the dinosaurs into the ground and destroys creatures and plants. The mysterious human civilization attempting to destroy the Gudo Tree, the special tree that contains pure hearts of it's any wishes, but one human who eats the Gudo Fruit which is actually a god tree who greet the normal humans to the normal trees. A human named Agito who wishing to become a Hero of Life and goes to the present Earth where giving the Gudo seed to somewhere else. However, the ancient civilization has been released from the unknown source of dark power called Ragaku which is call the D Force. While one Ragaku minion disobey the leader named Rouki, the leader tried to attack him before he gone escaped. After Agito plants the Gudo seed while he visited Muzutami house, Rouki visits the Muzutami house too and looking the Gudo sproutling as Agito asked him about Ragaku tribes and his unknown human race. When the Ragaku attacked, Agito and Rouki tells that they won't give up which is the Gudo sproutling blooms, glows to transformed the fruit into the belt which is allows transforms Agito into Kamen Rider Kuraga but also transform Ragaku into armor forms and possessing him however to defeat the Ragaku army.