First appearance: Battle 7
Height: 192cm
Type: Dou
Type: Katsujin Ken
Martial Arts: Karate (specializes in Mutenkendoku-style)

A 30-year-old master of karate who claims to hold 100 dan. Little is known about Sakaki's past; but he has mentioned that he used to travel the world and fight, and he also at one point belonged to a group that consisted of himself, a French martial arts master named Christopher Eclair, and an Englishman named Mycroft; but left them when their activities brought harm to the innocent, and later buried them alive.