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Secre Swallowtail 「セクレ・スワロテイル Sekure Suwaroteiru」 is the servant of Lemiel Silvamillion Clover, prince of the Clover Kingdom and the first Magic Emperor. She is transformed into an anti-bird named Nero after sealing Lemiel into a statue.
Black Clover is a Japanese manga series written and illustrated by Yūki Tabata. It has been serialized in Shueisha's Weekly Shōnen Jump magazine since February 16, 2015, and has been collected into 23 tankōbon volumes.
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