they were hinting asta black for since episode 1 : r/BlackClover

Watch Black Clover - Crunchyroll

Black Clover: Mahou Tei no Ken

Black Clover Episode 1: Asta and Yuno (rkgk) : r/BlackClover

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Black Clover: Season 1, Episode 33 - Rotten Tomatoes

Anime Review: Black Clover Episodes 1-3 by The-Sakura-Samurai on DeviantArt

Are Black Clover characters lightning speed? I ask this because the most recent episode shows True Lightning Magic which is stated to be as fast as real lightning. - Quora

Black Clover 1x01 Asta and Yuno - Trakt

Watch Black Clover Season 2 Episode 1 - I'm Home Online Now

Black Clover: Season One Part Two [Blu-ray] - Best Buy