Konami is the company that makes the PES series, or the winning eleven in Korea and Japan. They are best known for their very successful Metal Gear series and Silent Hill. They currently run several health and fitness clubs in Japan, where they originate from. Most video game companys do not do this so it is a out of the ordinary. Konami were founded in 1969 by Kagemasa Kōzuki and then only repaired jukeboxes. Later on they went into arcade games and now are the sixth biggest games company in Japan, where they also do trading cards, anime, tokusatsu, slot machines and some toys.
The current Konami logo.
Konami code
Konami is also known for its password, The Konami Code, which traditionally gives many powerups in its games. Although variants also exist, as in the Parodius series, and button naming can differ depending on the controller used, the classic Famicom or NES combination is: Up, Up, Down, Down, Left, Right, Left, Right, B, A. Although use of this code in more recent Konami productions has been sparse.
For more information on Konami see the wikipedia article.