The Samurai They Call Jack

 (Japanese: 彼らがジャックと呼ぶ武士, Karera ga Jakku to yobu bushi) is a Japanese action-adventure-comedy manga series based on  by Genndy Tartakovsky, being published by in Japan and by  in association with DC Comics in the United States since TBD 201?.

Synopsis
Long ago in a distant land, Aku, the shapeshifting master of darkness, unleashed an unspeakable evil.