はじまりの未来 (Hajimari no Mirai) is the opening theme of the animated film 劇場版プロジェクトセカイ　壊れたセカイと歌えないミク (COLORFUL STAGE! The Movie: A Miku Who Can't Sing), brought to life by a rare joint composition between two towering figures in the Vocaloid production scene, 40mP and sasakure.UK, with Hatsune Miku (初音ミク) on vocals. The song premiered in the rhythm game ecosystem on October 16, 2025, when it was added simultaneously to maimai でらっくす CiRCLE, CHUNITHM X-VERSE, and オンゲキ Re:Fresh, marking one of the few synchronized cross-title event releases among Sega's three arcade rhythm games. (The Asian version of maimai received the track a few months later, in February 2026.) The track sits at a brisk 156 BPM and runs approximately 2 minutes and 11 seconds, blending 40mP's polished pop sensibilities with sasakure.UK's signature rhythmic intricacy. Its lyrics weave musical imagery, headphones, signals, melodies, unfinished songs, into a narrative about refusing to give up and finding one's voice, mirroring the film's storyline of a Miku who has lost her ability to sing. In maimai, the Master chart was designed by ぴちネコ, known for dense, technically demanding patterns, and carries 623 total notes with an unusual concentration of 121 Touch notes and 55 Break notes, making it a standout 13.0-level challenge within the CiRCLE song list. The Expert chart, handled by サファ太, serves as a 10-level gateway with a more measured but still demanding 433-note layout.