CastSpace VTuber Shiranami Sazame Debuts With Voice Introduction Video and VRChat Plans

CastSpace has introduced its new VTuber Shiranami Sazame (白波さざめ), releasing a voice-enabled introduction video on October 9, 2026 as part of her debut. The video serves as an early introduction to both her design and personality.

Sazame is presented as a former whale shark from an aquarium and the “electronic sea.” Alongside conventional VTuber content, CastSpace plans to use VRChat as one of her spaces for conversation and audience interaction.

Quick Summary

• Name: Shiranami Sazame
• Japanese name: 白波さざめ
• Reading: しらなみさざめ
• Official romanization: Shiranami Sazame
• Talent type: VTuber
• Affiliation: CastSpace
• Corporate announcement: CastSpace / U-Stella Group Holdings
• Introduction video: released
• Introduction video date: October 9, 2026
• Company-listed timing: evening
• Video format: voice-enabled self-introduction
• Character concept: former whale shark
• Motif: whale shark
• Profile origin: aquarium
• Profile origin: electronic sea
• Catchphrase: greeting from the electronic sea
• Personality: described as broad and relaxed like the ocean
• Charm point: tail
• Skill: talking
• Skill: illustration
• Hobby: singing
• Likes: fish
• Likes: sushi
• Dislikes: nets
• Dislikes: bitter grass
• Fan name: 飼育員さん / Shiikuin-san
• Fan mark: 🍴🫧
• General / fan tag: #さざめの水槽
• Search tag: #しらなみたべて
• Birthday: September 23
• Planned content: chatting
• Planned content: ASMR
• Planned content: illustration
• Planned content: game streaming
• Planned content: song covers
• Social VR platform: VRChat
• VRChat plans: conversation and interaction
• VRChat avatar base: Lumia
• Lumia type: original 3D model
• Lumia creator / seller: U-Stella
• Sazame avatar: customized from Lumia
• Official website: live
• Official X: available
• Official YouTube: available
• Official TikTok: available
• Regular streaming schedule: not yet detailed
• Dedicated debut livestream timing: not detailed in the press release
• Original song: not announced in the debut release
• Dedicated merchandise: not announced in the debut release

Introduction Video and Shiranami Sazame Visual

Her Debut Opens With a Voice Introduction

CastSpace used a short introduction video as one of Sazame's first major debut materials. It establishes her visual identity while also giving new viewers an early chance to hear her voice and character presentation.

The concept is intentionally easy to recognize: a former whale shark arriving from a digital sea and asking the people she meets to teach her about this world.

VRChat Will Be Part of Her Activities

A notable part of the announcement is the emphasis on VRChat. CastSpace says Sazame plans to use the social VR platform for conversation and interaction rather than limiting her activities to conventional video streams.

Her VRChat avatar is built from Lumia, an original 3D model created and sold by U-Stella, then customized into Shiranami Sazame's appearance.

ASMR, Illustration, Games, and Song Covers

CastSpace has already outlined a broad content range for Sazame, including chatting, ASMR, illustration, gaming, and song covers.

Her community identity has also been established from the beginning. Fans are called “飼育員さん”, while 🍴🫧 serves as her fan mark.

Why This Matters

1) VRChat is part of the plan from the beginning

CastSpace is treating VRChat as an actual activity space for Sazame rather than merely another social account.

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2) Her fan identity is already established

A fan name, fan mark, and dedicated tags are in place at debut.

3) Her content can move across several formats

ASMR, illustration, gaming, singing, and social VR give the talent room to develop in multiple directions.

Shiranami Sazame and CastSpace Information

For now, the additional important information currently known includes:

• her official Japanese name is 白波さざめ
• the official romanization is Shiranami Sazame
• the reading is しらなみさざめ
• Shiranami Sazame is a new CastSpace talent
• U-Stella Group Holdings published the press release on October 10, 2026
• the voice introduction video was released the previous evening on October 9
• the video is one of the primary debut materials
• Sazame uses a whale-shark motif
• her character background identifies her as a former whale shark
• her origin is listed as an aquarium and the electronic sea
• her personality is described as broad and easygoing like the ocean
• her tail is identified as a visual charm point
• she is good at talking
• she is good at illustration
• singing is listed among her interests
• she likes fish
• she likes sushi
• she dislikes nets
• she dislikes bitter grass
• her birthday is September 23
• her official fan name is 飼育員さん
• her official fan mark is 🍴🫧
• #さざめの水槽 is used as a general/fan-related tag
• #しらなみたべて is used as a search tag
• future activities include chatting
• ASMR is part of the content plan
• illustration is part of the content plan
• game streaming is part of the content plan
• song covers are also planned
• VRChat will be used as an activity space
• social interaction and conversation are planned there
• the VRChat avatar uses Lumia as its base
• Lumia is an original 3D model
• Lumia is produced and sold by U-Stella
• the base model is customized into Shiranami Sazame
• CastSpace supports virtual talents and livestreamers
• its activities span streaming
• video is another area of its business
• music is included in its content operations
• VRChat is also part of CastSpace's content strategy
• talent support includes planning
• production support is included
• promotion is among its listed functions
• event operation is also part of its support
• U-Stella Group Holdings oversees businesses built around character IP and virtual experiences
• Sazame's regular activity schedule remains to be detailed
• no debut original song has been announced
• dedicated merchandise details have not been announced
• profile and social links are available through the Official Website
• updates are available through Official X
• the debut introduction is available through the Official Voice Introduction Video
• the avatar base is available through Lumia 3D Model on BOOTH
• group information is available through U-Stella Group Holdings

Closing

Shiranami Sazame's debut introduces a new CastSpace talent with a clear whale-shark identity, a voice introduction video, and VRChat built into her activity plans from the beginning.

A regular streaming timetable, original music projects, and dedicated merchandise have yet to be announced and remain areas to watch as her post-debut activities develop.