FUJIN Rumble is a Japanese techno track by COSIO of TAITO's in-house sound team ZUNTATA, originally created for the GROOVE COASTER EX arcade rhythm game. It crossed over into maimai as part of the first Tenkaichi Otogesai (天下一音ゲ祭), a跨-corporate rhythm-game festival that pitted songs from TAITO, KONAMI, and Bandai Namco against each other in a block-tournament format. The four participating companies agreed on a "four classical elements" theme, and TAITO, represented by its roller-coaster-themed GROOVE COASTER series, was assigned wind (風). COSIO has recounted that he rode an actual roller coaster named after Mount Fuji, Japan's tallest mountain, at a theme park to capture the sensation of wind and speed, walking away with the immediate title idea "FUJIN Rumble" (a play on the wind god Fūjin) and a desire to write an uptempo Japanese-flavored techno piece. The song arrived in maimai ORANGE on November 26, 2014 with a staggered release, early access at AOU-affiliated arcades, followed by a general rollout on February 16, 2015. Over subsequent maimai versions its difficulty ratings and genre classification have shifted (from COLLABO to GAME & VARIETY), but its identity as a fast, driving wind-element anthem has remained intact.