Lunatic Vibes is an instrumental original track composed and arranged by K-forest for maimai でらっくす, introduced during the BUDDiES PLUS update on May 10, 2024. Clocking in at 185 BPM with a driving electronic energy, the song serves as a key unlockable within the Metropolis Area 8 (メトロポリスちほー8) progression system, where players must accumulate 650 km of travel distance to access it. The accompanying video was produced by the artist サム (Sam), matching the song's frenetic pace with vivid visuals. The song sits within a narrative arc about geologist 哉輝 (Taiki) and his younger sister 十夜子 (Toyoko), whose father succumbed to a mysterious petrification disease (石化症), the same illness that later afflicts Toyoko as she follows in his footsteps. This lore backdrop, presented as flavor text in-game, frames Lunatic Vibes as a tense, high-stakes moment in the Metropolis storyline. On the charting side, the Master difficulty (level 13+, constant 13.8) was designed by Luxizhel and is recognized as a demanding boss chart, with 954 total notes and a dense mix of slides and touch notes that test player endurance. The Expert chart (level 11) was handled by サファ太 (Safata), offering a challenging but more approachable alternative. The song was made available by default starting from maimai DX PRiSM PLUS, and regional rollouts followed in Asia (September 2024) and China (July 2025 via 舞萌DX 2025).