秘神マターラ 〜 Hidden Star in All Seasons (Hishin Matara) is the theme of Okina Matara, the final boss of Touhou 16: Hidden Star in Four Seasons (東方天空璋). This arrangement was produced by ARM of the doujin music circle IOSYS as part of their "Touhou Niko Kara" (東方ニコカラ) series, a set of karaoke-style Touhou arrange videos originally uploaded to Nico Nico Douga. The track features vocals from the doujin circle Tamaonsen (魂音泉), a group well known in the Touhou arrange scene for their rap-infused vocal covers. The song was added to maimai as part of the FiNALE version on February 22, 2019, placing it among the last batch of new songs before the series transitioned to the DX (でらくす) era. On the charting side, the MASTER difficulty, designed by Tamago Dōfu (玉子豆腐), stands out for incorporating slide note patterns deliberately shaped like the characters ▶, Y, M, and ⑨, the last being a well-known symbol associated with the Touhou character Cirno. The EXPERT chart was designed by Takanashi-san (小鳥遊さん). With a BPM of 168 and a MASTER level of 13 (constant 13.4), the chart provides a moderately demanding challenge centered on dense slide sequences and a high total note count of 851.