Alternative:ニーベルングの指環 (Japanese); Harlock Saga: The Ring of the Nibelung (English); L'Anneau des Nibelungen (French) ; Nibelungen no Yubiwa ; The Ring of the Nibelung
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A sci-fi retelling of Wagner's "Ring of the Nibelungen", starring Captain Harlock. The series was first serialized from 1990 to 1991 in Chuukosha Fan, a used car magazine (!). A sequel was published for free directly on Shinchousha's webpage from 1997 to 2000, making it probably the first online manga.