スピカの天秤 is a high-energy original composition by Acotto, introduced to maimai でらっくす UNiVERSE on March 11, 2022 as part of the ONGEKI & CHUNITHM crossover category. The track originated from the first CHUNITHM Original Song Contest, where it won top honors in the Astraea (アストライア) division, a category named after the goddess-like character who appears on the jacket of another CHUNITHM song, エンドマークに希望と涙を添えて. Its inclusion in maimai marked the first time a CHUNITHM contest-winning song had been ported to another SEGA rhythm game, setting a precedent for future cross-title collaborations. Clocking in at a relentless 252 BPM, the song blends driving electronic beats with orchestral flourishes, matching its celestial title, "Spica's Balance", which references Spica, the brightest star in the constellation Virgo, and the scales of Libra. The Master chart, designed by 翠楼屋 (Suirouya), carries a difficulty constant of 14.4 and demands precise timing and stamina across 1011 notes. The Expert chart, initially released at level 12+ and later raised to 13 starting with FESTiVAL, was designed by はっぴー (Happy). An extended suite arrangement titled 組曲「スピカの天秤」 appears across six tracks on Acotto's album 新世界交響詩篇 (Shinsekai Koukyou Shihen).