乙女解剖 (Otome Kaibou, lit. "Maiden Dissection") is a Vocaloid track by prolific producer DECO*27, featuring Hatsune Miku. Originally released on DECO*27's 2019 album アンドロイドガール (Android Girl), the song arrived in maimai with the DX Splash update on September 17, 2020, as part of the niconico & VOCALOID genre. It was simultaneously added to オンゲキ (ONGEKI) SUMMER PLUS and later joined CHUNITHM CRYSTAL PLUS and SUPER STAR, making it a cross-franchise Sega rhythm-game staple of the 2020–2021 era. The title's provocative juxtaposition of "maiden" and "dissection" sets the tone for lyrics that pry open the awkward, anxious process of emotional intimacy, the push-pull between wanting to hide and wanting to be fully seen. The arrangement, credited to Rockwell and emon (Tes.), pairs mid-tempo pop-rock instrumentation at 134 BPM with DECO*27's layered vocaloid harmonies and a conversational, almost theatrical vocal delivery. The official music video, produced by the OTOIRO collective (akka, ろづ希, Yuma Saito, 八三), complements the track with surreal, pastel-toned visuals. In maimai, the Master chart (level 12, constant 12.5) by 隅田川星人 (Sumidagawa Seijin) is the highlight, weaving the song's syncopated vocal rhythm into dense slide and touch-note passages, while the Expert chart (level 8+) by サファ太 (Safata) offers a solid intermediate gate into the song's flow.