テリトリーバトル (Territory Battle) is a song by the Japanese music circle ツユ (TUYU), known for their emotionally charged blend of rock, electronic pop, and vocaloid-adjacent vocal delivery. The track was originally created as an original song for CHUNITHM PARADISE, marking TUYU's first-ever contribution to any rhythm game. It was subsequently brought into maimai でらっくす UNiVERSE PLUS on March 24, 2022, under the ONGEKI & CHUNITHM crossover genre category, and later appeared in Phigros and Muse Dash as well. The song was composed, arranged, and lyricized by Pusu, with vocals by Rei. Its title translates to "Territory Battle," and the lyrics frame a narrative of fighting to reclaim one's family from malevolent forces. A recurring numeric motif, "0419," threads through the lyrics and directly references the CHUNITHM story character "子守型アンドロイド＿0419＿Guardian" (nursemaid-type android 0419 Guardian), anchoring the song within the shared character lore that connects SEGA's rhythm game franchises. In maimai, テリトリーバトル received DX charts across all four difficulties. The EXPERT chart was designed by Jack, while the MASTER chart was crafted by アミノハバキリ (Aminohabakiri). The MASTER difficulty sits at level 13+ with a constant of 13.6, placing it among the more demanding offerings of its era. The song's availability narrowed over time: it was removed from the Japanese and Asian versions of maimai でらっくす BUDDiES PLUS on July 5, 2024, marking the first instance of an original composition being deleted from the Japanese version of any SEGA rhythm game. It remains present in the Chinese version (舞萌DX).