Overview
sweet little sister is a Touhou Project arrangement by the doujin music circle Silver Forest, based on U.N. Owen was Her? (U.N.オーエンは彼女なのか？), the Extra Stage boss theme of Flandre Scarlet from 東方紅魔郷 (Touhou Koumakyo). Originally released on Silver Forest's 2007 album 東方蒼天歌 (Touhou Sotenka), the track features vocals by Sayuri, the group's lead vocalist during its formative years, with arrangement and lyrics by NYO.
The song entered SEGA's rhythm game ecosystem starting with maimai at the launch of GreeN PLUS on February 26, 2014, arriving shortly after Silver Forest's brief disbandment (May 2012) and reformation (December 2013 via the circle Platinum Crest). It subsequently appeared in CHUNITHM and オンゲキ as well. Across its maimai tenure, the Standard charts underwent several level revisions, the Advanced rose from 6 to 7, Expert from 9 to 10+, and Master from 11 to 13 across successive versions. Nearly a decade after its original debut, sweet little sister received a full set of DX charts in BUDDiES PLUS (June 2024), designed by Luxizhel (Expert) and じゃこレモン / Jako lemon (Master). These DX charts were initially unlocked via stamp card before becoming generally available in PRiSM PLUS (March 2025).
Musically, the track is driven by a steady 168 BPM beat and Sayuri's distinct vocal delivery, with the tempo audibly accelerating toward the song's conclusion, a soflan element that the listed BPM alone does not convey. The accompanying music video was crafted by 七薙 (Nanana) of hightension wire, reorganized from VJ material originally shown at FLOWERING NIGHT Theater 2011, and the in-game jacket is drawn from a single scene within that video.
Videos
Charts
DX
BASIC
5(5)
204 notesDesigner: -|Tap 180Hold 11Slide 2Touch 7Break 4
ADVANCED
7(7)
309 notesDesigner: -|Tap 264Hold 16Slide 13Touch 13Break 3
EXPERT
10(10)
474 notesDesigner: Luxizhel|Tap 390Hold 27Slide 27Touch 13Break 17
MASTER
13(13.4)
777 notesDesigner: じゃこレモン|Tap 520Hold 29Slide 141Touch 21Break 66
STD
BASIC
4(4)
180 notesDesigner: -|Tap 163Hold 5Slide 5Break 7
ADVANCED
7(7)
310 notesDesigner: -|Tap 263Hold 29Slide 9Break 9
EXPERT
10+(10.6)
433 notesDesigner: 某S氏|Tap 315Hold 43Slide 61Break 14
MASTER
13(13.4)
617 notesDesigner: mai-Star|Tap 451Hold 41Slide 95Break 30
Trivia
- sweet little sister is an arrange of U.N. Owen was Her?, the Extra Stage boss theme of Flandre Scarlet from the Touhou Project game 東方紅魔郷 (Touhou Koumakyo).
- The arrangement first appeared on Silver Forest's 2007 album 東方蒼天歌 (Touhou Sotenka), years before its inclusion in any rhythm game.
- Vocals are performed by Sayuri, who served as Silver Forest's main vocalist during the circle's early era. The arrangement and lyrics were handled by NYO.
- Silver Forest disbanded in May 2012 and reformed in December 2013 through the circle Platinum Crest, making sweet little sister's February 2014 maimai debut one of the group's first post-revival rhythm game appearances.
- The music video was produced by 七薙 (Nanana) of hightension wire, who reorganized VJ footage originally created for FLOWERING NIGHT Theater 2011 into a PV-style format for DVD release. The in-game jacket art is a still from that video.
- Despite a listed BPM of 168, the song accelerates in its closing section. CHUNITHM's WORLD'S END chart (titled 速☆2) plays the entire song at this faster ending tempo as a gimmick.
- sweet little sister appears across all three major SEGA rhythm game franchises: maimai, CHUNITHM (added at CHUNITHM 1st launch), and オンゲキ (initially an event unlock during the 東方紅魔郷 chapter, later made default).
- The maimai Standard charts went through multiple level adjustments over the game's lifespan: the Advanced rose from level 6 to 7 in FESTiVAL, the Expert climbed from level 9 to 10+ in UNiVERSE PLUS, and the Master increased from level 11 to 13 in UNiVERSE PLUS.
- DX charts were added on June 7, 2024 as part of maimai でらっくす BUDDiES PLUS, over ten years after the original Standard charts. They were initially gated behind a stamp card and became generally unlockable on March 13, 2025 with the PRiSM PLUS update.
- The Standard Master chart was designed by mai-Star, while the DX Master was designed by じゃこレモン (Jako lemon). The Standard Expert was designed by 某S氏 (Bou S shi) and the DX Expert by Luxizhel.
FAQ
- Who composed sweet little sister?
- The original composition is by ZUN (Team Shanghai Alice) as the Extra Stage theme for Flandre Scarlet in 東方紅魔郷. The arrangement and lyrics for sweet little sister were created by NYO of Silver Forest, with vocals by Sayuri.
- What Touhou song is sweet little sister based on?
- sweet little sister is an arrangement of U.N. Owen was Her? (U.N.オーエンは彼女なのか？), the Extra Stage boss theme of Flandre Scarlet from 東方紅魔郷 (Touhou Koumakyo), the sixth game in the Touhou Project series.
- When was sweet little sister added to maimai?
- The song debuted in maimai at the launch of GreeN PLUS on February 26, 2014. DX charts were added later on June 7, 2024 as part of the BUDDiES PLUS update.
- Does sweet little sister have BPM changes?
- Yes. Although the listed BPM is a constant 168, the song audibly accelerates toward the end. This soflan (variable tempo) trait is referenced in CHUNITHM's WORLD'S END chart, which applies the faster ending tempo throughout the entire chart.
- Who designed the maimai charts for sweet little sister?
- The Standard Expert chart was designed by 某S氏 (Bou S shi) and Standard Master by mai-Star. For the DX charts, the Expert was designed by Luxizhel and the Master by じゃこレモン (Jako lemon).
- Is sweet little sister available in other rhythm games besides maimai?
- Yes. sweet little sister also appears in CHUNITHM (from its first version onward, with a WORLD'S END chart added in CHUNITHM AIR) and オンゲキ (initially as an event unlock during the 東方紅魔郷 chapter, later made permanently available).
- Why did sweet little sister's DX charts arrive so much later than the Standard charts?
- The DX chart system was introduced in later maimai versions. The original Standard charts date from the GreeN PLUS era (2014), while DX charts were back-added for touhou-category songs during the BUDDiES PLUS update (2024), approximately a decade after the song's initial maimai appearance.
External Links
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