Satsuki (サツキ) is preparing to release the Virtual Singer version of “Heredity (ヘレディティ)” through a YouTube premiere on September 20, 2026 at 9:30 PM JST. The version brings together six voices: Hatsune Miku, GUMI, IA, flower, Kafu and Kasane Teto SV.
Heredity already arrived in Project SEKAI COLORFUL STAGE! feat. Hatsune Miku on September 14 as a commissioned song for Wonderlands×Showtime. The upcoming premiere is therefore not the song's first appearance, but the release of Satsuki's separate Virtual Singer version and music video.
Quick Summary
- Title: Heredity
- Japanese title: ヘレディティ
- Type: commissioned song / rhythm game song / Virtual Singer version
- Music: Satsuki / サツキ
- Lyrics: Satsuki
- Composition: Satsuki
- Arrangement: Satsuki
- Game: Project SEKAI COLORFUL STAGE! feat. Hatsune Miku
- Related unit: Wonderlands×Showtime
- In-game status: available
- Added to the game: September 14, 2026
- How to obtain the song: through the in-game Present feature
- Latest version: Virtual Singer version
- Latest format: music video
- MV premiere date: September 20, 2026
- Premiere time: 9:30 PM JST
- Premiere platform: YouTube
- Status at verification: awaiting premiere
- YouTube video ID: K4TGmA71xgY
- Virtual Singer vocal count: six
- Vocal: Hatsune Miku
- Vocal: GUMI
- Vocal: IA
- Vocal: flower
- Vocal: Kafu
- Vocal: Kasane Teto SV
- Satsuki premiere announcement: September 18, 2026
- Standalone streaming release: currently listed as Coming Soon
- Standalone streaming date: unannounced
- Concurrent in-game event: Drive to Dream!
- Event begins: September 14, 2026 at 3:00 PM JST
- Event ends: September 20, 2026 at 8:59 PM JST
- MV premiere: 31 minutes after the listed end of Drive to Dream!
- Game platform: iOS
- Game platform: Android
- Game genre: rhythm & adventure
- Price model: free-to-play with paid items
- Manufacturer / development: SEGA / Colorful Palette
- Original game release: September 30, 2020
- Official game X: @pj_sekai
- Satsuki's official X: @32ki_May
- Related Satsuki album: Critical Damage
- Critical Damage digital release: June 1, 2026
- Previous six-voice context: Special Relief Committee / 特別救済委員会 also features Miku, GUMI, IA, v4 flower, Kafu and Kasane Teto
Heredity, Official MV and Project SEKAI
The Virtual Singer Version Brings Six Voices Together
The version announced by Satsuki is separate from Heredity's presentation as a Wonderlands×Showtime unit song inside Project SEKAI. For the producer release, six synthesized voices make up the vocal lineup.
They are Hatsune Miku, GUMI, IA, flower, Kafu and Kasane Teto SV. Satsuki had already confirmed the lineup when the song entered the game on September 14, while the scheduled video title once again lists all six directly.
That makes this more than a simple upload of the in-game unit version. It is a dedicated Virtual Singer interpretation of the commissioned song written for Wonderlands×Showtime.
Satsuki's September 14 announcement used the spelling v_flower, while the latest premiere title uses Flower. Both refer to flower in the producer-announced vocal lineup.
Heredity Has Been Playable Since September 14
SEGA and Colorful Palette officially added Heredity as a rhythm game song on September 14, 2026.
It is a Satsuki commission for Wonderlands×Showtime, and the song can be claimed by all players through the game's Present feature.
Project SEKAI's official announcement frames the song around Wonderlands×Showtime continuing toward a shining stage even when distance separates them.
Because the playable version came first, September 20 should not be treated as Heredity's first overall release date. It is specifically the scheduled premiere date for Satsuki's Virtual Singer music video.
The MV Premieres September 20 at 9:30 PM JST
Satsuki announced the premiere on September 18 and directed listeners to the YouTube page under video ID K4TGmA71xgY.
The scheduled time is September 20, 2026 at 9:30 PM JST.
At the time this article was verified on September 19, the premiere had not yet taken place. Full visual details, illustration or animation credits that may only become visible once the video opens, and the final runtime are therefore not being presented as confirmed facts before publication.
Indexed video metadata also currently states “Streaming → Coming Soon.” That indicates a separate music-distribution release is planned, but no specific standalone streaming date has been confirmed in the material available at verification.
The article's image grid uses the same official MV source once the premiere becomes available, without inventing scenes before viewers can actually watch them.
The Premiere Lands Immediately After Drive to Dream!
Heredity was added on the same day that the in-game event “Drive to Dream!” began.
SEGA lists the event period as September 14 at 3:00 PM through September 20 at 8:59 PM JST. During the event, players can earn Event P and Event Badges through rhythm-game modes and My SEKAI activity.
Notably, Satsuki's Virtual Singer premiere is scheduled for 9:30 PM JST on September 20, only 31 minutes after the listed end of Drive to Dream!.
The timing creates a neat transition from the Wonderlands×Showtime update period inside the game to Satsuki's producer release outside it. However, no verified official source states that 9:30 PM was intentionally chosen because of the event's closing time, so the connection should be treated as scheduling context rather than an explanation of Satsuki's intent.
Satsuki Has Used a Similar Six-Voice Lineup Before
A multi-voice arrangement is not entirely new territory for Satsuki.
The producer's second album, Critical Damage, digitally released through KARENT on June 1, 2026, includes “特別救済委員会 (Special Relief Committee)” featuring Hatsune Miku, GUMI, IA, v4 flower, Kafu and Kasane Teto.
In terms of the vocal characters involved, that lineup is extremely close to Heredity. The latest Heredity announcement more specifically identifies Kasane Teto SV and uses “Flower” in the video title.
Critical Damage also collects several other Satsuki tracks including Mesmerizer, Obsolete Meat, Facade Question and The nth Dimension, placing Heredity within an especially active 2026 period for the producer's catalogue.
That connection also makes Critical Damage a particularly relevant physical Satsuki release for readers interested in the producer's use of multiple synthesized singers.
Why This Matters
1) Six synthesized singers share one official version
Heredity combines Miku, GUMI, IA, flower, Kafu and Teto SV in Satsuki's producer version, giving it a distinct identity from the Wonderlands×Showtime presentation in the game.
2) The game song and Virtual Singer version have clearly separate releases
Players have been able to play Heredity since September 14, while Satsuki's music video premieres on September 20. They are two presentations of the same commission rather than one simultaneous release.
3) The MV arrives extremely close to the end of the in-game event
Drive to Dream! ends at 8:59 PM JST, followed by the scheduled premiere at 9:30 PM JST on the same date.
4) The vocal lineup connects neatly with Satsuki's existing catalogue
Nearly the same six vocal characters previously appeared together on Special Relief Committee, a track included on Critical Damage.
Music and Game Information
For now, the additional important information currently known includes:
- the song is titled Heredity
- its Japanese title is ヘレディティ
- the song is created by Satsuki
- Satsuki uses the X account @32ki_May
- Heredity is a commissioned song for Wonderlands×Showtime
- the rhythm game version was added on September 14, 2026
- all players can claim the song through Present
- the game version is already available before the producer MV premiere
- Satsuki describes the upcoming release as the Virtual Singer version
- that version uses six vocals
- Hatsune Miku is one of the vocals
- GUMI is one of the vocals
- IA is one of the vocals
- flower is one of the vocals
- Kafu is one of the vocals
- Kasane Teto SV is one of the vocals
- Satsuki's September 14 post used the spelling v_flower
- the latest premiere title uses Flower
- the premiere is scheduled for September 20, 2026
- the premiere begins at 9:30 PM JST
- the video is being released through YouTube
- its YouTube video ID is K4TGmA71xgY
- at verification on September 19, the MV had not yet premiered
- full visual details are not being assumed before the premiere
- standalone streaming is currently listed as Coming Soon
- no standalone streaming date has been announced
- Drive to Dream! is running during the same update period
- Drive to Dream! begins September 14 at 3:00 PM JST
- Drive to Dream! ends September 20 at 8:59 PM JST
- the MV premiere begins 31 minutes after the announced event end time
- official sources do not state that the two schedules were intentionally linked
- Project SEKAI is available on iOS and Android
- the game is categorized as rhythm & adventure
- it is free-to-play with paid items
- SEGA's product page lists SEGA / Colorful Palette for manufacturing and development
- Project SEKAI originally launched in Japan on September 30, 2020
- Critical Damage is Satsuki's second full album
- Critical Damage received its digital KARENT release on June 1, 2026
- Special Relief Committee on that album features Miku, GUMI, IA, v4 flower, Kafu and Kasane Teto
- premiere information is available through the Satsuki Official X Post
- the premiere page is available through the Heredity Official MV
- the game announcement is available through the Project SEKAI Official X Post
- song and event information is available through SEGA / PR TIMES
- official game information is available through the Project SEKAI Official Website
- the Android version is available through Project SEKAI on Google Play
- Satsuki's music catalogue is available through Satsuki on KARENT
Closing
Heredity has already been part of Project SEKAI since September 14, but Satsuki is now preparing another side of the song through a six-voice Virtual Singer version. Its official music video is scheduled to premiere on September 20, 2026 at 9:30 PM JST.
Full MV visual details and a standalone streaming date remain unavailable for now. What is already confirmed is the lineup of Miku, GUMI, IA, flower, Kafu and Teto SV, along with the official YouTube premiere page.
- Satsuki Official X — Official Heredity Virtual Singer Version Premiere Announcement
- Satsuki / YouTube — Official Heredity Music Video Premiere Page
- Project SEKAI Official X — Official Wonderlands×Showtime Heredity Song Addition Announcement
- SEGA / PR TIMES — Official Heredity Rhythm Game Addition and Drive to Dream Event Details
- SEGA — Official Project SEKAI Product Information and Platform Details
- Google Play — Official Japanese Project SEKAI Android Store Page
- KARENT — Official Satsuki Catalogue and Critical Damage Release Information
