はげしこの夜 -Psylent Crazy Night- is a crossover track that bridges two rhythm-game ecosystems: it originated in WACCA (where it appeared under the TANO\*C Original category) before being ported to maimai DX in the PRiSM era. The song was released on Christmas Eve 2024, a fitting date given its source material, a psychedelic speedcore reimagining of the well-known Christmas carol Silent Night (きよしこの夜). The title itself is a layered pun: はげしこの夜 replaces the gentle きよし (silent/pure) of the original with はげし (fierce/intense), while the English subtitle trades "Silent" for "Psylent", a portmanteau of "psychedelic" and "silent." The duo behind the track, aran and Kobaryo, are both established figures in the Japanese hardcore and speedcore scene, each with extensive discographies across doujin circles, rhythm-game soundtracks, and the TANO\*C label. True to the artists' reputations, the track is a high-energy assault of distorted kicks, rapid synth arpeggios, and chaotic breaks. Its tempo is anything but steady: the main body runs at 150 BPM with occasional bursts at 300 BPM, while the intro sits at 135 and the outro gradually drags from 135 down to a crawl of 100 BPM. The chart designers, サファ太 on Expert and じゃこレモン on Master, each bring their own interpretation of the song's manic energy. The Master chart at Lv. 13+ (constant 13.8) is particularly note-dense with 758 total notes, weaving Slide patterns and Break notes into the track's frenetic pacing.