Colorfull:Encounter marks a significant milestone for composer Reku Mochizuki, his very first original composition created specifically for the maimai series. Before this, Mochizuki's contributions to SEGA's rhythm game ecosystem came through cross-franchise titles: the high-energy INFiNiTE ENERZY -Overdoze- (featured across CHUNITHM, maimai, and オンゲキ) and the オンゲキ track Zitronectar. With Colorfull:Encounter, he steps fully into the maimai original song universe, delivering a driving 185 BPM electronic track that pairs anthemic melodies with a relentless rhythmic pulse. The song is wrapped in a narrative context conveyed through in-game flavor text: humanity has abandoned the Earth and returned to a star shrouded in darkness. A character named Kurohime closes her eyes and calls forth memories of a long-lost world, trees swaying in the wind, light flooding the land, water cycling energy through all matter, a fragile paradise lost because its inhabitants could not grasp the value of what they had. The text speaks of repeating the same mistakes over and over, yet pressing forward nonetheless, lending the track a bittersweet, almost cosmological weight beneath its energetic surface. On the charting side, the Expert difficulty was designed by はっぴー, while the Master chart (level 13+, constant 13.9) was handled by 鳩ホルダー, both well-known figures in the maimai chart design scene. The jacket art and in-game movie were produced by Kazuma Enta, cell, and SEGA / 尾崎ドミノ, giving the song a distinct visual identity within the Metropolis Area 9 unlock lineup.