しゅ～しん？変身☆ハカイシンzzZ is a high-energy original song created for SEGA's FEATCONTEST2024, where it claimed the maimai でらっくす賞 (maimai DX Award). The track was produced by YOFUKASHi Sound Team, a collective of ten composers and musicians, and features vocals by 編井うも (Umo Amii), a self-embodiment-type VTuber making her first appearance in the maimai series. Released on October 3, 2025, as part of the maimai DX CiRCLE update, the song sits in the niconico & vocaloid category despite being an original commission rather than a Nico Nico Douga cover or VOCALOID-produced piece. The title itself is a playful jumble of motifs: a shushing or sleepy sound (しゅ～しん), transformation (変身☆), a destruction god (ハカイシン), and a sleeping "zzZ" coda, suggesting a song about a chaotic entity who wakes and transforms. This thematic clash between sleep and destruction is mirrored in the music's variable BPM, which fluctuates between 120 and 190 (with a listed center of 180), giving the track an unpredictable, dynamic feel. On the charting side, the Expert difficulty (Lv 10+, constant 10.6) was designed by アマリリス, while the Master chart (Lv 13+, constant 13.8) was crafted by サファ太, both known names in the maimai chart design scene. The Master chart packs 903 total notes, with a notably high Break-note count of 126, making it a demanding play for its level bracket.