DECO*27's 妄想感傷代償連盟 (Mousou Kanshou Daishou Renmei) is a VOCALOID track featuring Hatsune Miku that joined the maimai song library with the MiLK PLUS update on June 21, 2018. The title strings together four Japanese nouns, delusion, sentiment, compensation, and league, into a single evocative compound, setting a reflective, emotionally charged tone that the music carries throughout. At 110 BPM, the song moves at a deliberate mid-tempo pace, allowing Hatsune Miku's vocals to ride a clean pop arrangement with melancholic undertones. Categorized under the niconico & VOCALOID genre, the track received a full five-chart suite from the outset, including a Re:MASTER difficulty available from day one, an uncommon treatment for the MiLK PLUS era. The Expert, Master, and Re:MASTER charts were handled by three different note designers (すきやき奉行, 緑風 犬三郎, and はっぴー respectively), each bringing a distinct approach to the same composition. The Re:MASTER chart in particular leans heavily on Slide notes (102 out of 725 total), creating a flowing, pattern-oriented layout that mirrors the song's smooth melodic lines. The song's in-game collection achievements borrow directly from its lyrical content: 99% SYNC unlocks the title「何回だって 傷付け合うんだ」("We hurt each other over and over"), while 100% SYNC yields「混ざり合う愛のフィロソフィー」("The philosophy of love mingling together"), hinting at a lyrical narrative centered on emotional entanglement and recurring conflict. The chart difficulty levels have also been rebalanced multiple times across maimau versions, Basic and Advanced saw early adjustments, while Expert, Master, and Re:Master received significant upward revisions between UNiVERSE+ and FESTIVAL, reflecting the evolving difficulty standards of the series.