In 1945, Dr. Ryuichiro Koga designed Metalder as a top-secret weapon for the Japanese Imperial Army for use in the Pacific War, modeling it after his late son, Second Sub-lieutenant Tatsuo Koga. However, the pacifistic Dr. Koga put Metalder to sleep in the Silver Caucus base and left for the America to work for NASA. During the 42 years, Dr. Koga's former colleague Major Muraki became the evil God Neros, ruler of Neros Empire. God Neros sends out his massive armies to kill Dr. Koga, who learned of their organization and returned to Japan to activate Metalder. Koga desperately tries to activate his android creation, who he named Ryusei Tsurugi, but the android is unable to understand what to do. In order to give Ryusei a "purpose", Koga runs out of the Silver Caucus base, allowing Neros' troops to kill him. Suddenly seeing his creator die, Ryusei becomes shocked, and soon is beaten by Neros' troops. Ryusei becomes fueled with rage, evoking the conversion to his 'true' form, the android known as Metalder. After a brief battle with Coolgin (which he loses), Ryusei goes onward, meeting future friend Mai Ōgi.
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