No Pain, No Game is a song by Japanese singer Nano, released as the opening theme for the anime Btooom! in 2012. The series follows players forced into a deadly survival game, so the track's urgent rock sound matched its high-stakes premise. Short clips of its opening lines later circulated on soundboards and in fan edits, where the phrase about the game beginning became a shorthand for starting a contest. Its appeal has lasted because the line works outside the anime too, signalling that a challenge is finally underway.