SILENT BLUE is an instrumental original track composed by かねこちはる (Chiharu Kaneko) for the maimai arcade rhythm game series, first appearing in the MiLK PLUS update as its fourth and final Challenge Track. Clocking in at a relentless 210 BPM, the piece is driven by synthetic orchestration and high-energy sequencing with no vocal line, the narrative is carried entirely by its arrangement and the accompanying video by 風鈴 (Fuurin). The title evokes the dim, hazy blue of early dawn moments before the sun breaks the horizon, a meaning the composer shared on Twitter upon the track's release. This serene imagery stands in deliberate contrast to the aggressive tempo and the punishing note density that awaits players on the upper difficulties. The MASTER chart (14+), designed by サファ太 (Safata), earned community recognition for its final "berserk rush", a concentrated gauntlet that sequences pattern motifs from older boss charts: the 16th-note runs of larva, the each-note alternations and 12th-note rotations of FUJIN Rumble, and the高速32分 (high-speed 32nd-note) spiral sections of Glorious Crown, all rolled into one climactic finish. The song later crossed over into SEGA's other rhythm titles オンゲキ (ONGEKI) and CHUNITHM, becoming part of the ゲキマイ/チュウマイ inter-title song pool. Its appearance in オンゲキ SUMMER cast it as a boss encounter against 藤沢柚子 at level 40, while its CHUNITHM LUMINOUS debut arrived through a limited-time National Matching event before being added to the standard item exchange.