Konami Group Corporation (Japanese: コナミグループ株式会社, Hepburn: Konami Gurūpu kabushiki-gaisha), commonly known as Konami, is a Japanese multinational entertainment company and video game developer and publisher headquartered in Chūō, Tokyo. Konami’s video game franchises include Metal Gear, Silent Hill, Castlevania, Contra, Frogger, Tokimeki Memorial, Gradius, Parodius, Yu-Gi-Oh!, Suikoden, and eFootball. The company also produces and distributes trading cards, anime, tokusatsu, pachinko machines, slot machines, and arcade cabinets. It has casinos around the world, and operates health and physical fitness clubs across Japan.

The company originated in 1969 as a jukebox rental and repair business in Toyonaka, Osaka, Japan, by Kagemasa Kōzuki, who remains the company’s chairman. Additionally, Konami owns Bemani, known for Dance Dance Revolution and Beatmania, as well as the assets of former game developer Hudson Soft, known for Bomberman, Adventure Island, Bonk, Bloody Roar, and Star Soldier. Konami is the nineteenth-largest game company in the world by revenue. Konami also publishes the Yu-Gi-Oh! Trading Card Game, one of the best-selling TCG in history.

Reference: Wikipedia