k4sen-Produced VTuber Brand UltraLMTM Names Six First-Generation Members
UltraLMTM's Patch-style operation, borrowed from online game updates rather than talent-agency calendars, is the structural feature that separates this debut from a standard VTuber generation rollout.
Key Facts
- GANYMEDE Inc. announced the six first-generation UltraLMTM members on September 28, 2026.
- Riina Koga Fluorite, Amari Mahiru, Yuime Yuina, Hanasake Sei, Washimi Daisho, and Yayoi Chiu are the six debuting members.
- Three members hold their first streams on Monday, October 5 at 19:00, and the other three on Tuesday, October 6 at 19:00.
- A program featuring the three debuting that day and k4sen streams at 20:30 on October 5 and October 6 on the UltraLMTM official YouTube channel.
- UltraLMTM opened auditions to applicants 18 or older residing in Japan, with gender, streaming experience, and game skill not considered.
Reporting from 4 sources: KAI-YOU, MoguLive, Inside, PANORA.
GANYMEDE Inc. announced on September 28, 2026 that six creators will debut under UltraLMTM, the VTuber brand produced by streamer k4sen, who belongs to the CREATOR division of the esports team ZETA DIVISION. The six are Riina Koga Fluorite, Amari Mahiru, Yuime Yuina, Hanasake Sei, Washimi Daisho, and Yayoi Chiu. First streams run over two days at 19:00 each day: three members on Monday, October 5 and three on Tuesday, October 6, each on their own YouTube channel. From 20:30 each day, the three who streamed plus k4sen appear on a program on the UltraLMTM official channel. Profiles, visuals, a trailer, and X accounts for all six launched with the announcement. The brand's stated concept is "Beyond imagination, ideals squared."
The announcement program "LMTiMes!" carried the reveal, and the brand's backstory casts k4sen as captain of the cyber exploration ship LMTM, which left Earth for the virtual world. The six members are described as the creators he found over a year of exploration, with profiles spanning games, singing, and dancing.
UltraLMTM runs on Patch-style operation, borrowed from online game updates rather than a talent-agency calendar. Two patch scales exist: minor 0.1-step changes such as 1.0 to 1.1, and major jumps such as Patch 1.0 to Patch 2.0. When a patch is large, the brand says it will disclose details in advance, and the debut itself is Patch 1.0, titled "THE LMTM AWAKENS." Its theme, "Awakening," covers the first streams plus talk projects with k4sen and game collaborations. Before that, the pre-debut stage was Patch 0.1.
The project was first announced at Tokyo Game Show 2025. Auditions asked only that applicants be 18 or older and live in Japan, with no requirements on gender, streaming experience, or game skill, and member count stayed hidden until TGS2026, where k4sen spoke about the theme, the debut dates, and the members. It is not stated what genre each member will stream.
Synthesized by Yomimono from the 4 cited sources below, including Japanese-language reporting where cited, then editorially reviewed before publishing.