究極焼肉レストラン！お燐の地獄亭！ (Kyūkyoku Yakiniku Restaurant! Orin's Hell Pavillion!) is a comedic Touhou Project arrangement by doujin circle IOSYS, specifically ARM and 夕野ヨシミ (Yoshimi Yuno) on composition, with vocalist 藤枝あかね (Akane Fujieda). The track originally appeared on IOSYS's 2009 album 東方超都魔転 (Touhou Chou To Ma Ten) before being licensed for maimai on January 8, 2015, as part of the ORANGE version update. The song's premise leans fully into absurdity: Rin Kaenbyou (火焔猫燐), the corpse-manipulating cat youkai who serves as the pet of the underworld ruler in Touhou Chireiden (Subterranean Animism), opens a yakiniku (Japanese BBQ) restaurant in hell. The arrangement pulls from two character themes, the energetic 死体旅行～Be of good cheer! (Rin's own theme) and the ominous 廃獄ララバイ (Hellfire Lullaby), though the version used in maimai (shared with SOUND VOLTEX) omits the latter section in favor of a tighter compositional arc. At a driving 185 BPM, the track delivers the hyperactive synth-and-vocal energy that defined IOSYS's peak-era Touhou output. In maimai, the song's chart levels have been adjusted across numerous versions, with the Master chart rising from an initial Lv11 rating in ORANGE to Lv12+ by the FESTIVAL+ era, a reflection of how the chart's complexity was re-evaluated over time. The Master chart, designed by 某S氏 (Mou S-shi), packs 61 Slide notes into a 459-note total, while the Expert chart by rioN is notable for its 34 Break notes in a compact Lv10+ layout.