Overview
Deep Sea Girl (深海少女, Shinkai Shōjo) is a Hatsune Miku Vocaloid original by Japanese producer ゆうゆ (yuuyu), first released on the 2012 compilation album EXIT TUNES PRESENTS Vocalodream feat. 初音ミク. The track's narrative, a girl sinking in darkness who finds the courage to reach toward the light, resonated deeply within the Vocaloid community and helped establish it as a lasting fan favorite. The official music video was produced by ﾏｸｰ and はるよ, giving the song a distinct visual identity separate from its in-game jacket.
In maimai, Deep Sea Girl debuted during the GreeN PLUS update on September 4, 2014, under the niconico & VOCALOID genre banner. Its Standard charts were among the most frequently rebalanced in the game's early history. The Master difficulty alone was adjusted across eight version cycles, rising from an initial level 11 to its current 13 (constant 13.2). The Standard Master chart, designed by Jack, challenges players with dense Tap-heavy patterns across 577 notes with no Touch gimmicks, a reflection of its pre-DX era origin. The Standard Expert chart, by mai-Star, is notable for its exceptionally high Hold-note density (107 of 276 total notes), demanding sustained accuracy.
Nearly nine years after the song's original maimai debut, DX charts arrived in maimai でらっくす FESTiVAL PLUS (March 2023), unlockable through Stamp Card progression. The DX Master chart, designed by ロシェ@ペンギン at level 13 (constant 13.0), reinterprets the song using all five modern note types, Tap, Hold, Slide, Touch, and Break, offering veteran players a fresh angle on a familiar track. Beyond maimai, Deep Sea Girl also appears in SEGA's CHUNITHM series, having been added to CHUNITHM AIR in 2016 and later refreshed in CHUNITHM SUPER STAR in 2021.
Videos
Charts
DX
BASIC
2(2)
125 notesDesigner: -|Tap 92Hold 16Slide 4Touch 12Break 1
ADVANCED
6(6)
268 notesDesigner: -|Tap 199Hold 23Slide 10Touch 24Break 12
EXPERT
9(9)
344 notesDesigner: 佑|Tap 229Hold 50Slide 26Touch 18Break 21
MASTER
13(13)
714 notesDesigner: ロシェ@ペンギン|Tap 530Hold 38Slide 92Touch 31Break 23
Trivia
- Deep Sea Girl was first released on the compilation album EXIT TUNES PRESENTS Vocalodream feat. 初音ミク in 2012, two years before its maimai debut. The album features multiple Vocaloid producers as part of the long-running EXIT TUNES compilation series.
- The official music video was produced by ﾏｸｰ (makuu) and はるよ (haruyo), giving the song a distinct visual identity separate from the maimai jacket art.
- In Asian English versions of maimai, the song is displayed as 'Deep-Sea Girl' (with a hyphen) and the artist is romanized as 'yuuyu'.
- The Standard Master chart (designed by Jack) has undergone nine level adjustments across maimai versions: starting at level 11 in GreeN PLUS, dropping to 10+ in PiNK, climbing to 11+ in MURASAKi, reaching 12 in DX PLUS and 12+ in Splash through UNiVERSE, and finally settling at level 13 from UNiVERSE PLUS onward, one of the most extensively rebalanced single charts in the maimai series.
- The Standard Expert chart (designer: mai-Star) contains 107 Hold notes out of 276 total, roughly 39% of its note count. This proportion of sustained notes is unusually high for a level 9+ chart.
- DX charts were introduced nearly nine years after the Standard charts, arriving on March 23, 2023, in maimai でらっくす FESTiVAL PLUS. They were unlockable via Stamp Card objectives rather than direct purchase, and in the Chinese version they were added in 舞萌DX 2024 under the same unlock method.
- The DX Master chart (designer: ロシェ@ペンギン) at level 13 (constant 13.0) includes 31 Touch notes, a note type that did not exist when the Standard charts were first created in 2014, giving experienced players a fundamentally different way to interact with the song.
- The maimai version of Deep Sea Girl is a shortened edit (2:12), cutting roughly nine seconds compared to the CHUNITHM version (2:21) and more from the original album track.
- The song's in-game genre classification shifted over maimai versions: it was categorized simply as 'niconico' from GreeN PLUS through ORANGE PLUS, and was updated to 'niconico & VOCALOID' starting from PiNK, reflecting maimai's evolving category system.
- Beyond maimai, Deep Sea Girl appears in SEGA's CHUNITHM series, debuting in CHUNITHM AIR on September 8, 2016, and later receiving updated charts in CHUNITHM SUPER STAR on April 28, 2021. The CHUNITHM Master chart (level 11+) was designed by ロシェ@ペンギン.
FAQ
- Who composed 'Deep Sea Girl' (深海少女)?
- The song was written, composed, and arranged by ゆうゆ (yuuyu) and features vocals from the Vocaloid voicebank Hatsune Miku (初音ミク). It was originally released on the compilation album EXIT TUNES PRESENTS Vocalodream feat. 初音ミク in 2012.
- What version of maimai added 'Deep Sea Girl'?
- The song debuted in maimai GreeN PLUS on September 4, 2014, with Standard charts only. DX charts were later added in maimai でらっくす FESTiVAL PLUS on March 23, 2023, unlockable via Stamp Card progress.
- What is the Master chart level for 'Deep Sea Girl' in maimai?
- The Standard Master chart (designed by Jack) is level 13 with a constant of 13.2. The DX Master chart (designed by ロシェ@ペンギン) is also level 13 with a constant of 13.0.
- What are the lyrics of 'Deep Sea Girl' about?
- The Japanese lyrics describe a girl submerged in a 'sea of sadness,' unable to open her eyes. She catches a glimpse of light and a person who draws her attention, ultimately finding the courage to leave the depths behind and take flight. The song explores themes of depression, isolation, self-discovery, and the yearning for human connection.
- Who designed the standard charts for 'Deep Sea Girl' in maimai?
- The Standard Expert chart was designed by mai-Star, and the Standard Master chart was designed by Jack. For the DX version, the Expert chart was designed by 佑 (Yuu) and the Master chart by ロシェ@ペンギン (Rocher@penguin).
- Does 'Deep Sea Girl' appear in other rhythm games besides maimai?
- Yes, the song also appears in SEGA's CHUNITHM series. It debuted in CHUNITHM AIR on September 8, 2016, and later received updated charts in CHUNITHM SUPER STAR on April 28, 2021.
- Why did the Standard Master chart for 'Deep Sea Girl' change level so many times?
- The Master chart was originally level 11 in GreeN PLUS and was adjusted across nearly every version as maimai's difficulty scaling evolved. It dropped to 10+ in PiNK, then climbed through 11+, 12, and 12+, before settling at level 13 from UNiVERSE PLUS onward. Each revision reflects the chart's enduring challenge relative to the game's changing difficulty standards.
- How do I unlock the DX charts for 'Deep Sea Girl' in maimai?
- The DX charts were added in maimai でらっくす FESTiVAL PLUS and are unlocked by completing objectives on a Stamp Card. In the Chinese version (舞萌DX 2024), the same Stamp Card unlock method applies.
