Overview
秋の未確認生物 (Aki no Mikakunin Seibutsu, "Autumn's Unidentified Creature") is a vocaloid track by the producer 子牛 (Koushi) featuring the voicebank Otomachi Una, added to maimai でらっくす FESTiVAL on November 4, 2022. The song spins a rapid-fire, pun-dense celebration of autumn gastronomy, nearly every line doubles as a food name, a homophone, or a playful twist on one. The title sets up the running gag: it asks what "autumn's unidentified creature" might be, and the chorus answers with seasonal staples, salmon (サーモン), chestnuts (マロン), apples (アップル), each treated as the punchline of a lyrical game. Guitar accompaniment by Kamome Ippitsu and a music video by Λkiranu and 鮭味 round out the production. In maimai, the track sits in the niconico & VOCALOID category and originally debuted with a Master chart at level 12+, later upgraded to level 13 (constant 13.0) starting in PRiSM PLUS, reflecting its dense pattern work and the 103 Break notes woven into its 899-note total. The Expert chart, designed by ロシェ@ペンギン, offers a level 10 gateway, while the Master chart, designed by はっぴー, demands precise execution across its mix of Slides and Breaks.
Videos
Charts
DX
BASIC
4(4)
204 notesDesigner: -|Tap 170Hold 15Slide 8Touch 4Break 7
ADVANCED
7(7)
364 notesDesigner: -|Tap 275Hold 18Slide 12Touch 29Break 30
EXPERT
10(10)
609 notesDesigner: ロシェ@ペンギン|Tap 457Hold 51Slide 45Touch 35Break 21
MASTER
13(13)
899 notesDesigner: はっぴー|Tap 638Hold 23Slide 101Touch 34Break 103
Trivia
- The lyrics are built around a dense web of autumn-themed wordplay. Every verse piles seasonal references, sweet potatoes (サツマイモ), matsutake mushrooms (松茸), persimmons (柿), salmon (サーモン), chestnuts (マロン), apples (アップル), onto homophones and puns, making the song a tongue-twisting celebration of Japanese fall cuisine.
- The Master chart was originally level 12+ when the song debuted in FESTiVAL. It was upgraded to level 13 (constant 13.0) beginning with the PRiSM PLUS version, reflecting the chart's long-standing difficulty relative to its initial rating.
- Before the FESTiVAL PLUS update, the song was credited in-game simply to 子牛, without the feat.音街ウナ suffix. The vocaloid attribution was added in a later revision.
- The guitar track was performed by Kamome Ippitsu, a well-known figure in the Japanese doujin music scene who has contributed guitar work to numerous vocaloid and rhythm-game songs.
- The music video was created by the artists Λkiranu and 鮭味.
- Playing the song once unlocks the title 「おいしい！」 (Oishii! / 'Delicious!'), and achieving Full Combo unlocks the title 「それは即ち」 (Sore Sunawachi / 'That is to say'), both phrases lifted directly from the song's chorus.
- The song runs 2 minutes and 21 seconds.
- In the Asian version of maimai DX, 秋の未確認生物 was added on March 9, 2023. In the Chinese version (舞萌DX 2023), it arrived on March 1, 2024.
- The vocaloid used is Otomachi Una (音街ウナ), a voicebank developed by the Internet Co., Ltd. known for its bright and youthful timbre.
FAQ
- Who composed 秋の未確認生物?
- The song was composed, arranged, and written by the producer 子牛 (Koushi). Guitar was performed by Kamome Ippitsu.
- What vocaloid is used in 秋の未確認生物?
- The song features Otomachi Una (音街ウナ), a vocaloid voicebank developed by Internet Co., Ltd. known for its bright vocal character.
- What level is the Master chart of 秋の未確認生物?
- The Master chart is level 13 with a difficulty constant of 13.0. It was originally level 12+ when added in FESTiVAL and was upgraded to 13 starting from PRiSM PLUS.
- What is 秋の未確認生物 about?
- The song is a playful wordplay track about autumn foods. The title asks 'what is autumn's unidentified creature?' and the chorus answers with seasonal items like salmon, chestnuts, and apples, with nearly every line built around homophones and puns related to Japanese autumn cuisine.
- When was 秋の未確認生物 added to maimai?
- It was added to maimai でらっくす FESTiVAL on November 4, 2022 in Japan, March 9, 2023 in the Asian version, and March 1, 2024 in the Chinese version.
- Who designed the charts for 秋の未確認生物?
- The Expert chart was designed by ロシェ@ペンギン (Rocher@penguin), and the Master chart was designed by はっぴー (Happy).
- What unlock titles are associated with 秋の未確認生物?
- Playing the song unlocks the title 「おいしい！」 (Delicious!), and achieving Full Combo unlocks the title 「それは即ち」 (That is to say), both directly quoting the song's lyrics.
