Brynhildr in the Darkness (極黒のブリュンヒルデ, Gokukoku no Buryunhirude, lit. "Extreme-Black Brynhildr") is a is a manga written and illustrated by Lynn Okamoto. It began serialization in Shueisha's seinen manga magazine Weekly Young Jump in January 2012. A television anime adaptation by Arms began airing on April 6, 2014.