"Lost Desire" brings together Powerless (also known in Vocaloid circles as 無力P) and vocalist Sennzai for a dramatic, emotionally charged crossover originally from lowiro's mobile rhythm game Arcaea. It was one of the tracks featured in Arcaea's paid "Black Fate" song pack before crossing into maimai でらっくす FESTiVAL in March 2023, continuing a history of reciprocal content sharing between the two rhythm game franchises. The track's dark, driving energy at 170 BPM is reflected in its lyrical content, which dwells on themes of weeping, clashing emotions, and consuming darkness, anchored by the repeated refrain "哭いて…" (weeping). In maimai, the song's dense MASTER chart was designed by じゃこレモン (Jako Lemon), known for technically demanding patterns that make full use of all five note types, while the EXPERT chart was handled by 翠楼屋 (Suirouya). Beyond the game, an instrumental version of "Lost Desire" was released on a dedicated single, offering a chance to hear Powerless's composition and arrangement without vocal layering. The song carries a © lowiro 2023 credit, reflecting its Arcaea lineage.