In Chaos is a high-energy track composed by Hiroshi Kawaguchi (credited as Hiro「Crackin'DJ」) that originally appeared in Sega's 2000 arcade rhythm game Crackin'DJ. The song was included in the very first maimai arcade release on July 11, 2012, making it one of the oldest tracks in the game's history. Its rap-style English lyrics, built around shouted hooks like "One, two, in chaos!" and "Can't keep up, losing your mind, what you gonna do?", give it a distinct party-anthem atmosphere against a driving 140 BPM beat. Over maimai's version history, In Chaos has shifted through multiple genre classifications, from ORIGINAL at launch, through ANIME & GAME, GAME, and SEGA, before settling into GAME & VARIETY in the DX era. The song received a Re:Master chart (level 14+, constant 14.8) in maimai MURASAKi PLUS on December 5, 2017, charted by チャン@DP皆伝 (Chan@DP kaiden), notable for its 880-note layout with zero Hold notes, an all-Tap, Slide, and Break arrangement. An UTAGE (宴) party chart was added in maimai FiNALE and later revived in BUDDiES. With the transition to maimai でらっくす (DX), the song received updated jacket artwork, and its background video was replaced with a still image of that new jacket. In Chaos later crossed over into ONGEKI bright MEMORY in March 2022, where its MASTER chart holds the distinction of having the lowest note count of any level 14+ ONGEKI chart.