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From Dan of Population GO:
Based off of The Song of the Nibelungs comes a manga about bravery, honor, and heroism. As the last of his people, Siegfried will stop at nothing until he becomes a legendary knight whose story will last eternity. If his legend lives on forever, then so will the memory of his people...and that is his sole reason for going on.
亡国のジークフリート ซิกฟรีด อัศวินเถื่อน (Thai) Das Nibelungenlied