You can find the English dub on Crunchyroll . Lullaby of the Dawn (Manga) – Volume 4
Despite Naofumi nearly winning, Myne interferes with magic, allowing Motoyasu to win unfairly. Raphtalia's slave crest is forcibly removed, leading to a tense emotional climax. (Dub) 4 : Lullaby at Dawn
Alternatively, if you are referring to literature, of the manga series Lullaby of the Dawn by Ichika Yuno was recently released in English. You can find the English dub on Crunchyroll
Following a successful wave of catastrophe, a banquet is held at the Melromarc Castle. Motoyasu, the Spear Hero, discovers Raphtalia is a slave and challenges Naofumi to a duel for her freedom. Myne interferes with magic