Desperado Waltz is an instrumental electronic track by ぺのれり (Keita Miyoshi), a Japanese creator recognized for VOCALOID original songs and instrumental compositions. The track first appeared in オンゲキ SUMMER (July 2019) before arriving in maimai でらっくす Splash through the cross-game collaboration umbrella shared by SEGA's rhythm-game lineup, ONGEKI, CHUNITHM, and maimai. The title evokes a triple-meter waltz form, yet the 172 BPM tempo and aggressive electronic arrangement push the piece into high-energy territory, creating an intriguing contrast between the classical dance reference and the modern production. ぺのれり himself noted on Twitter that when he first composed the track, he thought of it as a "strange / weird" piece, but after seeing the finished in-game charts, he felt the arrangement "somehow became cool", a comment that captures the symbiotic relationship between the composition and its rhythm-game realization. In maimai DX Splash, the song was unlockable during the ONGEKI Area 2 event (March 4 – April 15, 2021) by accumulating 336 km of travel distance, with subsequent permanent availability in later versions. The track also appears in CHUNITHM SUN and is available by default in later editions of all three games. With no lyrics, the music itself carries the full emotional weight, a driving, synth-focused instrumental that rewards close listening as much as precise play.