This is a 2002 OVA that commits fully to the bit: arcade games as literal superpowers, tournament brackets as world-ending stakes, magical underwear as the source of gaming prowess. The absurdity is the entire point. It's built for people who want their action comedies unapologetic and their premise completely unhinged, the kind of show that explains its own ridiculousness and then moves on. There's a real tournament happening here with real opponents, and the show treats a girl beating people at Street Fighter as genuinely consequential. You either get what this is doing in the first five minutes or you never will.
Fubuki Sakuragasaki is an arcade prodigy with an unconventional secret weapon: her Passion Panties, which power up her gaming skills. She enters the BAG tournament, the world's premier arcade competition, and works her way toward the title of greatest arcade gamer on the planet. The villainous Gulasic Group plans to conquer the world by way of the same tournament, and its players are formidable opponents. As Fubuki fights her way up the rankings, she joins forces with the legendary Mr. Mystery, and together they take on the four Gods of Gaming to keep the arcade world safe for everyone. Expect absurd sci-fi action mixed with comedy and fan service humor, delivered with a premise that never takes itself too seriously.