WE'RE BACK!! is an instrumental original track composed by Zekk (Choi Min-hyuk), a South Korean producer whose high-BPM electronic and hardcore compositions appear across the BMS scene and SEGA's rhythm game franchises. Running at 185 BPM with a duration of 2 minutes 12 seconds, the track is built around driving synth leads and aggressive percussion that match its emphatic title, a declaration of return that mirrors its cross-game journey. The song debuted in CHUNITHM NEW PLUS on August 4, 2022, as part of the NEW ep.VI MAP 2, then crossed over to オンゲキ bright MEMORY in November 2023 and finally arrived in maimai DX BUDDiES on February 29, 2024. In maimai, it was initially unlockable via the CHUNITHMちほー3 Area, requiring 480 km of cumulative travel distance during a limited window until May 9, 2024. The maimai MASTER chart, designed by Luxizhel at level 14 (constant 14.0), packs 961 notes into its dense pattern, while the EXPERT chart (level 12.2) from 鳩ホルダー offers a slightly more accessible high-tier challenge. A later UTAGE (宴) chart was added in PRiSM PLUS on June 20, 2025, labeled "逆" (reverse) at difficulty 12+? and credited to "SLIDE BACK!!", a deliberate pun on the song title.