アルカンシエル (Arc-en-ciel) is a track by Yamajet that joined the maimai DX song library as part of the BUDDiES version, released on September 14, 2023. Its title is the katakana rendering of the French word for "rainbow," a motif that carries into the song's bright, energetic character. Categorized under ゲーム＆バラエティ (Game & Variety), the track pulses at a steady 176 BPM, a tempo Yamajet has frequently employed across their rhythm game contributions. The song's Expert chart was crafted by ロシェ@ペンギン, while the Master chart was designed by アマリリス. Notably, the Master difficulty originally launched at Lv13 during BUDDiES through PRiSM, but was revised downward to Lv12+ starting with the PRiSM+ update, a relatively uncommon post-release level adjustment that reflects the chart's reassessment within the broader difficulty curve of the version.