Riki-Oh (力王) is a Japanese manga series written by Masahiko Takajo and illustrated by Tetsuya Saruwatari. It was serialized in Shueisha's manga magazine Business Jump from 1987 to 1990, with its chapters collected in 12 volumes. The story follows the titular Riki-Oh, a young man who has learned the martial art of Naike Kenpō from one of Chiang Kai-shek's bodyguards, and has become so strong that he can punch holes through people and solid objects.
A two-episode original video animation (OVA) was released in 1989 and 1990, and a live-action film, Riki-Oh: The Story of Ricky, premiered in 1991.
Plot
The story is set in a post-apocalyptic future where global warming and warfare has left the world struggling, while Japan descended into an economic depression in the 1990s which led to increased crime.
The story centers around Saiga Riki-Oh, blessed with inhuman strength, who, after taking revenge against a yakuza who was responsible for the death of a child who befriended him, ends up in a maximum security prison owned by a private organization. The story follows Riki and his search for his little brother Saiga Nachi, who bears a manji symbol on his right hand and also possesses superhuman strength.
Riki-Oh encounters and battles many deadly opponents with either superhuman strength or martial arts during his travel for avenging his mother and finding his brother.