In the future, mankind has developed a multi-sport tournament known as Iron League, using artificially intelligent robots as the players instead of humans. The competition is very popular. However, its main support comes from the Dark Organization, a group that produces cheating Iron Leaguers that use dirty and violent tactics in games as a sure ticket for fame and popularity. While the sports community has been turned into a dangerous and (figuratively) bloody contest, Silver Castle, the team with the lowest winning ratio, tries to preserve true sportsmanship by playing sports by their original rules without any cheating or violence. The team's fate as well as the fate of the Iron League itself is changed when two Iron Leaguers - Mach Windy, Dark Prince FC's former ace striker and Magnum Ace, a mysterious but skillful baseball-playing Leaguer - join Silver Castle, and gradually lead the team back to its forgotten glory. It's not all fun and games, however; as the story goes on, it is revealed that the Iron League is actually a front for something far more sinister...
<br><br>(Source: TV Tropes)

Maruta Mari's parents both work in theatre: her father is a stage designer and her mother is an actress. Mari has been interested in paintings and manga since early childhood. She studied at a junior college of art, where she was also a member of the local manga research club.

Apart from voice acting work, Mari is active as a jazz singer and is currently a member of the unit Wild Strawberry together with Inoue Kikuko, who is also a seiyuu, and the pianist Ogasawara Junko. In June 2013, she married a person she's been dating for 10 years.

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