Overview
SINSEIKI (心世紀) is an Xtuber unit under the GIRLS REVOLUTION PROJECT label of KAMITSUBAKI STUDIO, consisting of ORIHIME, KAKYOIN, and GARASUMIYA.
The unit is characterized by “heart-generation music” that crosses the boundary between reality and virtuality. Wrapped in the light of a supernova, the girls race through sleepless nights. SINSEIKI is one of the core units driving the Girls Revolution Project storyline.
Production Line-up and Musical Style
SINSEIKI’s songs are supplied by creators spanning both the Vocaloid and commercial pop worlds.
- Yano Tatsuya: on “Fake Night Cinderella”, “Contrast”, “Million Complexity” and “Zatsukichou”, the group’s central composer.
- HIDEYA KOJIMA: writing and arranging “Perfection”, “Usonaki” and “FantastiQ”.
- Atsu Mizuno, 100kai Outo, Toa, Purukichi, shikisai and Tanaka each contribute singles with distinctly different characters.
Stylistic position: the studio describes SINSEIKI as “new-generation music belonging to the heart generation, characterised by sensuous sound where reality and the virtual interlace”. Against TSUMITOBATSU’s hard, aggressive line, the Shin side leans toward urbanity, youth and light cross-dimensional electronics.
Timeline
- August 2024: Debuted with the single “フェイクナイト・シンデレラ”.
- April 1, 2025: Performed at KAMITSUBAKI WARS 2025 Kanagawa Front “Girls Revolution Project 1st LIVE / Act 1 『KAIHEN』”.
- July 16, 2025: Released the dual-unit single “改変” together with TSUMITOBATSU.
- October 29, 2025: Released their 1st Album “改変 -心-”.
- May 2026: Performed at KAMITSUBAKI WARS 2026 Shibuya Front “Girls Revolution Project 2nd LIVE『Revolutio』”.
Live, Collaboration and Spin-off Anime Archive
Major performances
| Performance | Members |
|---|---|
| KAMITSUBAKI FES ‘24 THE DAY THE EARTH STOOD STILL | All |
| KAMITSUBAKI WARS 2025 Kawasaki Front, “Girls Revolution Project 1st LIVE / Act One ‘Kaihen‘“ | Kakyoin, Orihime, Garasumiya, Mikoto, Yunagi, Hinageshi |
| Girls Revolution Project Virtual mini Live “Petalstride -Kodou-” | Kakyoin, Orihime, Garasumiya |
| Sanrio Virtual Festival 2026 | Kakyoin, Orihime, Garasumiya |
| KAMITSUBAKI WARS 2026 Shibuya Front, “Girls Revolution Project 2nd LIVE ‘Revolutio‘“ | All |
Collaboration campaigns
- IMAGINARY BASE AKIHABARA × Girls Revolution Project: round 1 “SINSEIKI” (1–31 March 2025), round 2 “TSUMITOBATSU” (1–29 April 2025).
- Girls Revolution Project × Karaoke no Tetsujin (23 July – 31 August 2025).
- Girls Revolution Project × Okada Museum of Art — Gorgeous Revolution: Heart and Sin — (31 January – 31 March 2026).
Spin-off short anime
- Girls Revolution Project -Omohi no Katachi, Kimi no Katachi-: a short anime streamed every Wednesday on YouTube from October 2024 to June 2026, telling of girls from the “other side” who, to recover their true selves, keep collecting “shapes of yearning” while caught up in phenomena called urban legends.
- Blu-ray: released 26 October 2025, containing all 27 episodes plus audio commentary from the cast.
Position within the project: as a new experiment by KAMITSUBAKI STUDIO, the Girls Revolution Project goes beyond music into Live2D game-streaming and other activities close to an ordinary virtual YouTuber. SINSEIKI is the vehicle for that “XTuber” line.
Selected Works
Expand full singles list
Singles
| Release date | Title |
|---|---|
| 2024-09-18 | パーフェクション (feat. 御莉姫, 佳鏡院, 硝子宮 & 小島 英也) |
| 2025-01-22 | Ephemeral (feat. 御莉姫, 佳鏡院 & 硝子宮) |
| 2025-02-26 | ココロト (feat. Toa) |
| 2025-04-02 | うそ鳴き (feat. 御莉姫, 佳鏡院 & GARASUMIYA) |
| 2025-10-29 | 改変 -心- (feat. たなか & LLLL) |
| 2025-10-29 | FantastiQ (feat. Hideya Kojima) |
| 2025-10-29 | いずれ僕は溶けて (feat. Purukichi) |
| 2025-10-29 | コントラスト (feat. 矢野達也) |
| 2025-10-29 | ミリオン・コンプレクシティ |
| 2025-10-29 | ロストオービット (feat. shikisai) |
| 2026-02-20 | 雑几帖 |
| 2026-04-01 | フェイクナイト・シンデレラ (KAIHEN Live ver.) |
1st Album “Kaihen -Shin-” Track Archive
SINSEIKI’s first full album Kaihen -Shin- was released on 29 October 2025. Its eleven tracks are the culmination of the “heart” side of the world-view.
| # | Track | Production |
|---|---|---|
| 1 | Fake Night Cinderella | feat. Yano Tatsuya |
| 2 | Ephemeral | feat. 100kai Outo |
| 3 | Lost Orbit | feat. shikisai |
| 4 | Perfection | feat. HIDEYA KOJIMA |
| 5 | Kokoroto | feat. Toa |
| 6 | Izure Boku wa Tokete | feat. Purukichi |
| 7 | Contrast | feat. Yano Tatsuya |
| 8 | Usonaki | feat. HIDEYA KOJIMA |
| 9 | FantastiQ | feat. HIDEYA KOJIMA |
| 10 | Million Complexity | feat. Yano Tatsuya |
| 11 | Kaihen | feat. Tanaka / LLLL |
Album structure: Kaihen -Shin- is a mirror album to TSUMITOBATSU’s Kaihen -Tsumi-. Both include a song titled “Kaihen” and approach the same theme from the “heart” and “sin” sides respectively. Yano Tatsuya contributes four tracks, making him one of the most important composers on the Shin side.
