"411Ψ892" is a maimai original track by electronic producer Tanchiky, added to maimai DX FESTiVAL on February 3, 2023, as part of the Heavenly Realm Area 6 (天界ちほー6) unlock wave. True to Tanchiky's signature style, known from earlier maimai contributions and their prolific BMS/doujin output, the track drives forward at 184 BPM with aggressive synth work and a tense, atmospheric soundscape that matches its dark fantasy framing. The song's cryptic alphanumeric title, punctuated by the Greek letter Psi (Ψ), continues Tanchiky's penchant for encoded or numeral-heavy track names. In-game, a flavor text establishes a narrative backdrop: a world where skies turn black, poisonous mist shatters life, and a calamity called "Diani" brings despair and destruction, while druid priests vanish from the Dana Temple. This lore situates "411Ψ892" within the broader Heavenly Realm chihō storyline, giving the track a mythic dimension beyond its rhythm-game function. On the charting side, the MASTER difficulty (level 14, constant 14.3) was co-designed by the duo サファ太 vs じゃこレモン, a joint charter session that yielded a 945-note layout rich in Slide (86) and Break (103) notes. The EXPERT chart (12+ / 12.7) by ロシェ@ペンギン also carries a notably high Break count (85 out of 631 total notes), giving both upper difficulties a percussive, high-score-ceiling character.