Horoscope Express is an original instrumental track composed and arranged by pan (パン), commissioned for maimai でらっくす BUDDiES, the series' 2023 edition. At 236 BPM, it sits among the higher-tempo original tracks in the maimai library, driven by relentless percussion and crisp synth leads that define pan's production style. The in-game movie was created by あひるひつじ (Ahiru Hitsuji), complementing the song's astrological theme with vibrant, looping visuals. The track debuted on September 14, 2023 as part of the パーリィちほー (Party Area) unlock system in BUDDiES, where players had to accumulate distance in the area to access it. With the arrival of maimai DX PRiSM on September 12, 2024, Horoscope Express became available by default in all regions. The song's EXPERT chart was laid out by はっぴー (Happy), while the MASTER chart, designed by あまくちジンジャー (Amakuchi Ginger), originally launched as a level 13+ (13.9) before being upgraded to level 14 (14.0) starting in BUDDiES PLUS, reflecting the chart's demanding slide-heavy chorus patterns and a taxing final section that tests players' cross-hand fluency.