Aah! Harimanada

 is a Japanese media franchise that began with a 1991 manga by Kei Sadayasu published in Kodansha's "Weekly Morning". An anime television series was broadcast in 1992. The series was later adapted to a video game developed and published by Sega for the Sega Game Gear and Sega Mega Drive. A port was also released on the Game Boy, released by ASK.
Premise.
On the first day of the September Professional Sumo Tournament, the new "yokozuna" Harimanada enters the ring wearing an eerie mask, surprising the audience. He then declares that he will break Futabayama's streak of 69 consecutive wins, and that he would retire on the spot if he loses even once. This invokes the wrath of the Japan Sumo Association and makes an enemy of all "makuuchi" wrestlers.
Media.
E&G Film produced an anime television series based on the manga, titled . It was directed by Norio Osada. The series premiered in Japan on TV Tokyo on April 23, 1992, and ran for 23 episodes until its conclusion on October 1, 1992. "Aah! Harimanada" is notable as an animated series based on the rare theme of sumo wrestling; following the end of the series' broadcast, no other such series would be produced until the premiere of "Rowdy Wrestler!! Matsutaro" in 2014.
"Aah! Harimanada" was adapted into three video games of the same name in 1993. A Game Gear title was developed by Sega and released on July 2. A Game Boy title by Ask Kodansha was released on July 23. Sega also developed a title for the Mega Drive that was released on September 3. The Mega Drive game was criticized for its "poor responsiveness" and "boring gameplay". British gaming magazine Sega Pro rated the Mega Drive version 59 out of 100.