EP Uroboros – Black Swallowtail Dec 26, 2021 be1lyric Track 01 from EP "TVアニメ'六花の勇者' OP 第二章 Black Swallowtail / TV Anime 'Rokka-Braves Of The Six Flowers' OP 2nd Black Swallowtail (TV 애니메이션 '육화의 용사' 오프닝 제2장 Black Swallowtail)"Release Date: 2015.10.08