時計の国のジェミニ (Gemini in Clockland) is a maimai original instrumental track composed and arranged by 黒魔 (Chroma), the alias of Masaki Sekikawa, a musician from Aomori Prefecture widely recognized in both the chip-tune and Vocaloid circles. Sekikawa is also known as じたばたP for his Vocaloid productions and gained early notoriety for a viral Nintendo-themed ear-copy video on NicoNico Douga. Within Sega's rhythm game ecosystem, he has contributed tracks across multiple titles, including 分からない in maimai, シャッキーーン!! in CHUNITHM, and Don't Fight The Music in オンゲキ. Debuting in maimai DX Splash PLUS on March 18, 2021, 時計の国のジェミニ was originally locked behind a distance-based unlock in the Shuwashuwa Area 2, requiring players to accumulate 360 km before the track became playable. It received a general catalog unlock on March 24, 2022 with the arrival of UNiVERSE PLUS. The in-game movie was produced by Fiz, whose visuals frame the song's title concept, a clockwork realm of twin identities, through gear motifs and dual-figure imagery. The jacket itself translates the title as Gemini in Clockland. At a driving BPM of 180, the song showcases Chroma's signature rapid-fire chip-tune sequencing: bright, densely-layered synth melodies and square-wave leads that evoke a playful yet mechanical fantasy atmosphere. No lyrics are present; the music carries the narrative entirely. The chart lineup spans from a Basic level 4 to a formidable Re:MASTER (level 13+, constant 13.7) added on November 20, 2025 in maimai DX CiRCLE. The Expert chart was designed by はっぴー, the Master chart by 華火職人 (Kanon Oguni), featuring a notably high Touch-note count of 115, and the Re:MASTER by アマリリス (amaryllis).