"Seyana. ～何でも言うことを聞いてくれるアカネチャン～" is a VOICEROID original song by Japanese composer GYARI, best known for his works featuring text-to-speech characters. The track debuted in maimai MiLK PLUS on June 21, 2018, under the niconico & vocaloid category, and has been carried forward through every subsequent maimai version. Vocals are primarily handled by Kotonoha Akane (琴葉茜), a VOICEROID character voiced by AI, Inc. with a distinctive Kansai-ben dialect, and Yuzuki Yukari (結月ゆかり), another widely used VOICEROID library. The title translates roughly to "Seyana. ~The Akane-chan Who Will Do Anything You Say~," with "Seyana" (せやな) being a Kansai-region colloquialism meaning "Yeah, I guess so" or "Sure." The song's central joke is that despite the premise of an obliging Akane-chan, the actual lyrics are delivered with comical indifference and outright dismissal. In the full version, Akane begins with a neutral "Isn't that good?" (いいんじゃない？), but the maimai cut removes this opening, launching instead into her infamous exclamation of "あ　ほ　く　さ" (aho kusa, roughly "what a pain" / "you idiot"), which became the track's most recognizable moment among players. The disconnect between the accommodating title and Akane's blunt attitude forms the song's comedic core. GYARI's composition sits at a steady 144 BPM, carried by a light electronic-pop arrangement. The chart design leans into the vocal performance: the EXPERT chart (designed by Moon Strix) places notes in sync with Akane's spoken lines, while the MASTER chart (designed by 玉子豆腐 / Tamagodoufu) shifts emphasis to Yukari's contributions. The MASTER chart was originally rated level 11+ at launch and was gradually re-evaluated upward across several version updates, settling at level 13 (constant 13.3) by UNiVERSE+, a significant difficulty reassessment that reflects the chart's technical density.