Sawada Keizaburo, also known as The Bird of Darkness (暗黒鳥, Ankoku Tori), is an affiliated fighter within the Kengan matches, typically for Murder Music. He represented Murder Music during the most recent Kengan Annihilation Tournament.

Sawada was originally from a family of prominent Japanese traditional dancers and had enough talent to become heir of his family. However, an incident caused him to switch over to ballet and he eventually took the path to becoming a fighter... During his time at Karei High School, Sawada encountered Rihito for the first time, starting their vitriolic rivalry.

(Source: Kenganverse Wiki)