立川浄穢捕物帳 (Tachikawa Jou'e Torimonochō) is a theatrical, high-energy track that leans into an Edo-period detective concept, its title follows the classic 捕物帳 (torimonochō) naming convention of Japanese period crime fiction, while the jacket art reinforces the setting. The song was composed by Karasuyasabou (烏屋茶房), a veteran of the doujin and BMS scenes whose rhythm-game credits span maimai, CHUNITHM, and オンゲキ, operating here under the elaborate alias 青島探偵事務所器楽捜査部B担 (Aoshima Detective Agency Instrumental Investigation Division, B Section). The alias itself is a playful extension of the detective theme, and the composer confirmed the connection on Twitter. At 210 BPM, the track is a brisk, brass-and-percussion driven instrumental that evokes a samurai-era manhunt, tense, propulsive, and unrelenting. Originally released in maimai DX on 2020-01-10, it was first filed under the オリジナル (Original) category before being moved to オンゲキ＆CHUNITHM in the DX PLUS update, reflecting its cross-series origin. The song is available across all regions (JP, INTL, USA, CN). The Master chart, designed by シチミヘルツ, stands out for its unusually high Slide note density (140 Slides out of 971 total notes, roughly 14%), creating a twirling, serpentine pattern that matches the music's frantic chase feel. The Expert chart was designed by サファ太. Both higher difficulties underwent level revisions in early updates, the Master chart climbed from 12+ at launch to its current 13+ rating from Splash onward, while the Expert settled at 11 after starting at 10+.