Leave All Behind is a high-energy instrumental track by the composer rider, crossing over into maimai from Pigeon Games' mobile rhythm game Phigros. Released as part of maimai でらっくす PRiSM PLUS's Phigros collaboration area (Phigrosちほー) in September 2025, the song arrived alongside other Phigros-originating tracks as one of the featured unlockable pieces. At 150 BPM, Leave All Behind drives forward with a crisp electronic arrangement built around tight synth leads, punchy percussion, and a climactic breakdown section, a style characteristic of rider's broader rhythm-game portfolio, which spans titles such as Lanota and Arcaea as well. The song's jacket art depicts a stylized pigeon (鳩, Geopelia), a playful nod both to the developer's name (Pigeon Games) and to the maimai chart designer 鳩ホルダー (Hato Holder), who crafted the Expert chart. The Master chart, designed by Luxizhel at level 13+ (constant 13.8), sits among the higher-difficulty offerings of PRiSM PLUS and features dense Tap clusters, generous Touch note placements, and a note total of 684, demanding precise coordination across all five note types.