UNIT B Officially Releases First Single “Fureaguransu” With a New Recording and Mix

UNIT B (Pre-Debut) has officially taken its first original song, “Fureaguransu” (フレアグランス), from a public demo into a full release. hololive RECORDS announced the single on October 1, 2026 and confirmed that the material previously published on YouTube underwent new recording and mixing before entering formal distribution.

The song is directly connected to UNIT B's earliest period at mekPark. Its demo was published on May 22, 2026 with Yoinagi Neon and Kiyosumi Lyra on vocals, Reimei Mira on piano, and Lyra responsible for Words & Music. The official version is now available through COVER's distribution smart link while mekPark's profile continues to identify Neon, Mira, and Lyra as UNIT B (Pre-Debut).

Quick Summary

• Artist: UNIT B
• Artist status: UNIT B (Pre-Debut)
• Original Japanese Title: フレアグランス
• Official Global / English Title: unannounced / not found in verified primary sources
• Official Romanization: not found in verified primary sources
• RYGAMES Manual Romanization: Fureaguransu
• Release format: single
• Discography position: UNIT B's 1st single
• Official release date: October 1, 2026
• Main announcement: hololive RECORDS
• Exact official X post: located and verified
• Song origin: UNIT B's first original song
• Previous version: official YouTube demo
• Demo date: May 22, 2026
• Demo length: approximately 1 minute 40 seconds
• Official-version change: new recording
• Official-version change: new mixing
• Lyrics: Kiyosumi Lyra / 清澄ライラ
• Composition: Kiyosumi Lyra / 清澄ライラ
• Arrangement: Kiyosumi Lyra / 清澄ライラ
• UNIT B member: Yoinagi Neon / 宵凪ネオン
• UNIT B member: Reimei Mira / 玲銘ミラ
• UNIT B member: Kiyosumi Lyra / 清澄ライラ
• Neon's demo role: Vocal
• Mira's demo role: Piano
• Lyra's demo role: Vocal / Composer
• Demo Words & Music: Kiyosumi Lyra
• Demo Vocal: Yoinagi Neon / Kiyosumi Lyra
• Demo Piano: Reimei Mira
• Demo All Other Instruments: Kiyosumi Lyra
• Demo MIX: Kiyosumi Lyra
• Demo Movie: POhL
• Official UNIT B concept: three members brought together through music
• Unit direction: moving forward with songs they create themselves
• Project: mekPark
• Project operator: COVER Corporation
• mekPark: a talent-development project leading toward professional debut
• mekPark structure: three trainees and one director operate as a unit
• Maximum development period: two years
• Early debut: possible if required criteria are met
• UNIT B status at release: still Pre-Debut
• Single release: not a formal-debut announcement
• Distribution: multiple music services through COVER's smart link
• Lyra's MIX credit: explicitly belongs to the demo version
• Official-release credits: lyrics, composition, and arrangement by Lyra
• Final mix engineer: not detailed in the verified release sources
• Physical edition: not announced in the verified release sources
• Single universal price: not announced
• Current status: officially released

Single, Demo, and Official Visual

From a May Demo to UNIT B's First Official Single

“Fureaguransu” did not suddenly appear on its release date. UNIT B had already introduced the material during the earliest phase of its public activities through an official demo video published on May 22, 2026.

The demo description explicitly presented it as UNIT B's first original song. At approximately one minute and 40 seconds, the video was still a compact preview, but it already established the musical division of roles that would become central to the trio's identity.

Yoinagi Neon and Kiyosumi Lyra provided vocals, Reimei Mira played piano, and Lyra was credited for Words & Music, all other instruments, and MIX on the demo version. POhL created the video.

On October 1, 2026, the work changed status. hololive RECORDS introduced it as a new single and stated that the first original song previously available as a YouTube demo had now received an official release.

mekPark also identifies it as UNIT B's 1st single, meaning “Fureaguransu” has moved beyond being a brief introductory YouTube piece and into formal music distribution.

That transition also provides a particularly clear record of UNIT B's development: listeners can hear the starting point of an original song and then, several months later, receive a newly produced official version.

The Official Version Received New Recording and Mixing

The most important part of the hololive RECORDS announcement is the confirmation that the official release is not simply the old demo file moved onto streaming platforms.

For the October 1 release, “Fureaguransu” received new recording and new mixing.

That distinction matters when reading the song's credits. The May demo description lists Kiyosumi Lyra for “All Other Instruments & MIX,” so that credit directly documents the production of the demo version.

Release data available through Uta-Net, meanwhile, lists Lyra for lyrics, composition, and arrangement on the song released October 1.

The verified release sources do not identify the engineer responsible for the final official mix. Lyra's demo MIX credit therefore should not automatically be transferred to the new master.

Keeping those credits separate prevents two different production stages from being merged into one. The demo documents how the song was first introduced, while the October release represents a newly produced version prepared for official distribution.

Neon, Mira, and Lyra Were Built as a Music Unit From the Start

mekPark's official website describes UNIT B as three people brought together through music, moving forward with songs they created themselves.

The three members are Yoinagi Neon, Reimei Mira, and Kiyosumi Lyra.

The “Fureaguransu” demo demonstrates that concept directly. Neon handles vocals, Mira plays piano, while Lyra appears as both vocalist and composer and takes responsibility for a large portion of the demo's production.

Music therefore did not arrive as supplemental content after UNIT B became established. An original song was already present near the very beginning of their activities.

The official-release credits reinforce the same pattern. Lyra is listed as lyricist, composer, and arranger, meaning the core songwriting remains tied directly to a member of UNIT B.

That makes “Fureaguransu” important beyond simply being first in chronological order. It is also one of the earliest pieces of evidence for how UNIT B intends to define itself: vocals, piano performance, composition, arrangement, and the process of making music are all central to the unit's public identity.

The Single Arrives While UNIT B Is Still Pre-Debut

This official music release takes place in a different context from a debut single by a group that has already completed a full professional launch.

mekPark's official profile continues to use the name UNIT B (Pre-Debut).

COVER launched mekPark on May 8, 2026 as a talent-development project in which three trainees and one director operate together as a unit.

The objective is professional debut. COVER explains that the development period may last for up to two years, although a unit can potentially debut earlier if it satisfies the required criteria.

Those criteria include operational evaluation, activity data, and fan support. The Pre-Debut phase is therefore not simply an informal label but a defined stage within mekPark's development structure.

For that reason, the release of “Fureaguransu” should not be described as confirmation that UNIT B has formally debuted. What can be confirmed is that its first original song has now received new production and formal distribution while the Pre-Debut status remains in place.

That context is exactly what makes the single a notable milestone: officially distributed music has arrived before their mekPark journey has been declared complete.

“Fureaguransu” Has Represented UNIT B's Creative Identity From the Beginning

There is a meaningful difference between a unit receiving its first original song after a long period of activity and a unit introducing original music almost immediately.

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UNIT B belongs to the second category.

The “フレアグランス” demo appeared during the group's opening period on May 22, 2026. At that stage, viewers were already introduced to Neon as a vocalist, Mira as a pianist, and Lyra as a vocalist and composer.

The October 1 release then lists Lyra for lyrics, composition, and arrangement.

That aligns closely with mekPark's official description of UNIT B as a trio moving forward with music they make themselves.

“Fureaguransu” therefore serves two roles. It is officially their first single, but it had already been part of UNIT B's identity well before receiving that formal status.

Its journey from demo to a newly produced release also demonstrates that material created during the Pre-Debut period can develop into an officially distributed work rather than remaining only as an experimental archive.

Official Distribution Takes the Song Beyond the Demo Format

Before October 1, the primary official way to hear “Fureaguransu” was UNIT B's short demo video.

The new release changes that. hololive RECORDS directs listeners to a COVER smart link, while mekPark states that the first single is available through multiple music distribution services.

Uta-Net has also registered the release with an October 1, 2026 date and lists Kiyosumi Lyra for lyrics, composition, and arrangement.

The verified sources used for this article do not provide one universal price because access and purchasing models can differ across music services.

No physical edition is announced in the main verified release materials. An official global/English title or official Latin romanization also could not be located in primary sources.

RYGAMES therefore uses “Fureaguransu” as a manual romanization for the English and Indonesian headlines, microblog, Short, and slugs. The original Japanese title “フレアグランス” remains preserved inside the article and its metadata.

Why This Matters

1) Listeners can follow a work from public demo to full release

The May demo and October single represent two separate stages of the same original song, with new recording and mixing specifically confirmed for the official version.

2) The creative work comes from inside UNIT B

Kiyosumi Lyra handles lyrics, composition, and arrangement, while the demo documents Neon and Lyra's vocals and Mira's piano as part of the unit's musical identity.

3) The release happens during the Pre-Debut phase

UNIT B now has an officially distributed single even though its development journey within mekPark has not yet concluded.

4) “Fureaguransu” has represented UNIT B from the beginning

This original song was not added much later. Its demo appeared during the group's opening period and eventually developed into the first official single.

Music and UNIT B Information

For now, the additional important information currently known includes:

• “Fureaguransu” is the manual romanization used by RYGAMES
• the official Japanese title is “フレアグランス”
• no official global/English Latin title was found in verified primary sources
• no official romanization was found in verified primary sources
• the song is released under UNIT B
• it is UNIT B's 1st single
• the official release date is October 1, 2026
• hololive RECORDS published the main release announcement
• the exact main X status has been located
• the announcement states that the song previously existed as a YouTube demo
• the announcement confirms new recording
• the announcement also confirms new mixing
• the official distribution smart link uses the cover.lnk.to domain
• the original demo was published May 22, 2026
• the demo is approximately one minute 40 seconds long
• its description identifies it as UNIT B's first original song
• Yoinagi Neon performs Vocal on the demo
• Kiyosumi Lyra performs Vocal on the demo
• Reimei Mira performs Piano on the demo
• demo Words & Music are credited to Kiyosumi Lyra
• demo All Other Instruments are credited to Kiyosumi Lyra
• demo MIX is credited to Kiyosumi Lyra
• POhL created the demo Movie
• release data lists Kiyosumi Lyra as lyricist
• release data lists Kiyosumi Lyra as composer
• release data lists Kiyosumi Lyra as arranger
• the final mix engineer is not detailed in the verified sources
• UNIT B consists of Yoinagi Neon, Reimei Mira, and Kiyosumi Lyra
• Yoinagi Neon's Japanese name is 宵凪ネオン
• Reimei Mira's Japanese name is 玲銘ミラ
• Kiyosumi Lyra's Japanese name is 清澄ライラ
• the official profile describes them as three people brought together through music
• it also says they move forward with songs they create themselves
• UNIT B is part of the mekPark project
• mekPark is operated by COVER Corporation
• COVER announced mekPark on May 8, 2026
• three trainees and one director form one unit under the mekPark structure
• the objective is professional debut
• the development period can last up to two years
• an earlier debut can occur if the unit meets the required criteria
• UNIT B remains labeled Pre-Debut at the time of this release
• the single release is not confirmation of a formal debut
• no physical edition has been announced in the main verified release materials
• one universal price has also not been announced
• official distribution is available through the Official Streaming Link
• the unit profile is available through the UNIT B / mekPark Official Profile
• UNIT B activity is available through UNIT B Official X
• the main announcement is available through the Exact hololive RECORDS X Post
• additional music announcements are available through hololive RECORDS Official X
• project updates are available through mekPark Official X
• the original demo is available through the Official “Fureaguransu” Demo

Closing

“Fureaguransu” gives UNIT B a concrete milestone during its Pre-Debut phase. An original song that first appeared as a demo has now received new recording and mixing, entered official music distribution, and become the group's first single.

At the same time, the boundaries of the available information remain clear. UNIT B is still officially listed as Pre-Debut, the final mix engineer and any physical edition have not been detailed in the verified sources, and no official global/English title or official romanization has been identified.