Travis Bruno of Capsule Computers writes:

"King of Thorn may hold a few similarities with other apocalypse titles, it provides a fast paced survival story that holds as many twists and turns as the vines wrapping the facility in the movie. Viewers are taken on a roller coaster ride of adrenaline packed survival. Combine this with the fact that the movie is a treat for both the eyes and the ears and you have an excellent anime movie that should not be passed up." (Anime, King Of Thorn) 9.5/10