taboo tears you up is a hardcore-Touhou arrangement by REDALiCE, a founding member of the doujin labels HARDCORE TANO*C and IOSYS. Originally released on the 2007 IOSYS album 東方萃翠酒酔 (Touhou Suisui Shusui), the track mashes up four boss themes from 東方紅魔郷 ～ the Embodiment of Scarlet Devil, U.N.オーエンは彼女なのか？ (U.N. Owen was Her?), ツェペシュの幼き末裔 (The Young Descendant of Tepes), 亡き王女の為のセプテット (Septette for the Dead Princess), and 魔法少女達の百年祭 (The Centennial Festival for Magical Girls), weaving them into a single high-energy 180 BPM composition. The song's lyrics are written from the perspective of Flandre Scarlet, the sealed vampire younger sister of 東方紅魔郷's final boss, capturing her trademark childish boredom, destructive impulses, and fixation on "eyes." The accompanying Flash animation, created by kouks, became a hallmark of IOSYS's early video-production style, and the track went on to appear across multiple rhythm-game franchises including maimai, CHUNITHM, SOUND VOLTEX, GROOVE COASTER, and WACCA. In maimai the song debuted with the MURASAKi edition in December 2016 as a Standard-chart set, and later received a full set of DX charts (with Touch-note support) in でらっくす UNiVERSE in September 2021, initially unlockable via stamp card before becoming freely available. The MASTER DX chart, designed by サファ太, sits at level 14 and features dense streams and slide patterns characteristic of high-level Touhou arrangements in the series.