Overview
ARU (存流 / ある) was a virtual singer in the SINSEKAI STUDIO branch of KAMITSUBAKI STUDIO and one half of Albemuth with ASU. She began activity on June 20, 2021 and graduated on April 9, 2024.
Her whisper-like, breathy, restrained vocal colour and white gothic-elegant visual identity, designed by Mai Yoneyama, formed one side of Albemuth’s contrast with ASU’s brighter and more impulsive singing.
Project Position and Performance History
ARU is one of the core virtual singers of the SINSEKAI system and a member of the duo Albemuth.
| Dimension | Content |
|---|---|
| Debut | 20 June 2021 (official debut with a first upload to YouTube) |
| Affiliation | SINSEKAI RECORD |
| Unit | Albemuth with ASU (formally formed 2022-11-19) |
| End of activity | Formal graduation at Albemuth 1st ONE-MAN LIVE “罪と楽園” on 9 April 2024 |
Where the project began: on 20 June 2021, KAMITSUBAKI Studio announced the spin-off project “SINSEKAI CITY PROJECT” and released material relating to ARU, who also made an official debut the same day with a first upload to YouTube — ARU’s arrival is itself the beginning of the SINSEKAI worldview.
Basic Profile
| Item | Detail |
|---|---|
| Name | ARU / 存流 / ある |
| Activity began | June 20, 2021 |
| Graduation | April 9, 2024 |
| Unit | Albemuth with ASU |
| Character concept | Mai Yoneyama |
| Vocal profile | Whisper-like, breathy, restrained, and atmospheric |
“Whisper-voice demon” and similar expressions are audience descriptions of her vocal performance, not official job titles.
Activity History
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June 20, 2021: Began activity as ARU / 存流.
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November 19, 2022: Began Albemuth’s unit activities with the first live eve / ADAM.
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July 5, 2023: Released the ARU-side album eve alongside ASU’s ADAM.
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April 9, 2024: Graduated; the original Albemuth duo period ended.
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September 2026: Listed on the ALLT STUDIO official website roster (formerly of the SINSEKAI system).
Representative Works
Expand full singles list
Singles
| Release date | Title |
|---|---|
| 2018-04-19 | Call Me Anytime (feat. Demxntia) |
| 2026-03-02 | 三日月の街 |
| 2026-04-24 | ピンクリボン～願い～ |
Graduation and Permanent Archiving
- 5 February 2024: an official notice announced that ARU would end activity after the solo concert on 9 April, and that Albemuth would disband accordingly.
- 9 April 2024: Albemuth 1st ONE-MAN LIVE “罪と楽園” was held; ARU formally graduated and the unit disbanded; the final original song, 《舟》, was released the same day.
- Archival handling: KAMITSUBAKI fully preserved all of his historical singles and released the duo album with ASU in physical form as a permanent archive of memory.
Industry significance: ARU’s exit is regarded as a benchmark case of a virtual artist “exiting with dignity” — the unit does not erase its history because a member graduated, and the body of work continues to exist in the label’s catalogue as an archive. This also provided KAMITSUBAKI with a reusable paradigm for handling later member graduations.
Unit Relationship and Record Boundaries
Albemuth was an independent unit with its own name, visual concept, live project, and member-side albums. eve should therefore be recorded in both ARU’s connected history and the unit’s catalogue, while ARU’s post-graduation status should not be merged with ASU’s continuing solo activity.
Related Projects / Setting
ARU is a key entry point into SINSEKAI STUDIO’s early other-world line and the first phase of Albemuth.
