Staff have found the face behind the virtual version of King Organization chief vassal Heart after putting out an audition call in August. Heart made his debut on YouTube on Tuesday and greeted viewers with a hearty laugh. The YouTube channel is part of the 35th anniversary celebration of Tetsuo Hara and Buronson 's post-apocalyptic action series. The channel answers the question "What if Heart came across a smartphone at the end of the century?

Heart has no ending or story paths of his own, however retains a fully fleshed out upgrade chart. He is one of Shin 's four main lieutenants, named after the king of hearts playing card. Although he is a relatively good fellow who treats his minions well, he snaps into a whiny and homicidal bully at the sight of his own blood. Called "pig" and "sluggish" by his opponent, he faces Kenshiro. He heavily relies on his size and brute strength to attack his opponents, using bear hugs or hopping on top of fallen opponents to crush them with his weight. He prides the size of his wide belly, which has the power to stop a normal man's fist with ease. Heart offers a play style unavailable with other characters and is a welcome addition to the existing cast.

He dresses in a minimalist and simplistic fashion, as he wears no shirt, a pair of suspenders with spikes near the top although he gains a pair of shoulder pads in his confrontation with Kenshiro , a pair of leather vambraces with spikes, and a pair of boots with armored plates on the front. He is normally a well-mannered, civil, and calm individual who speaks in a soft tone of voice in contrast to a great majority of the members of KING. He is kind enough to scold his own men for attacking a bartender, and politely let him continue his own work, and even told him to let him know if he and his men were bothering him with a cheerful smile.

It was produced by Toei Animation , the same studio who worked on the TV series that was airing at the time, with the same cast and crew working on both projects. Unlike the TV series, the movie is not a direct adaptation of the manga, but instead tells an alternate story that rearranges characters and plot elements from the manga's first 72 chapters. However, the film retains the more violent content of the original manga, which the television series lacked. A global nuclear war has turned most of Earth into a contaminated wasteland, with humanity's survivors now fighting over the few uncontaminated food and water supplies still remaining. Kenshiro, a master of the deadly martial art Hokuto Shinken , is traveling with his fiancee Yuria when they are confronted by a gang led by Ken's former friend Shin, a master of the rival Nanto Seiken style.