這是奧特曼歐布起源的故事。遙遠銀河彼方的惑星 O-50（O-Fifty）―好不容易才走到在那秘境上聳立的「戰士之顛」的2位青年，凱(石黒英雄)及Jagras Juggler(青柳尊哉)，向能夠看清擁有優秀資質之人並授予成為「光之戰士」力量的眩光伸手。光選擇了凱，得到聖劍Orb Caliber的凱成為了奧特曼歐布。凱及Juggler為了從Dr. Saiki(和泉元彌)操縱的宇宙惡魔别西魯卜的威脅中守護人們而出發。向王立惑星Kanon襲來的Saiki，要求交出繼承戰神之血的女王Amate(福田沙紀)。將軍Raigo(榎木孝明)主張先發制人攻擊，女王Amate下命讓近衛隊長Shinra(前川泰之)與Saiki進行對話。聲稱自已目的是「創造沒有紛爭的宇宙」的Saiki。尋求真正和平意義的年輕光之戰士・凱。賭上全宇宙的First Mission(第一個任務)現正開始―。
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