Seth is an assassin of the Night Blade and the wielder of the Eliminators. Previously, he worked for Chaos, but now acts independently. He is the archrival of Hyde. During the day, he is a first-year High School student.

Seth is one of the twelve characters introduced in the original version of UNDER NIGHT IN-BIRTH.

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Seth is one of the twelve characters introduced in the original version of UNDER NIGHT IN-BIRTH.

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