KURAND Inc. will sell “Rikei Kyodai No.54 Re,” the second sake collaboration between “Hakui Koyori” – the researcher of the VTuber unit [Secret Society holoX] from “hololive production” operated by COVER Corp. – and the sake brand “Rikei Kyodai,” in limited quantities from 20:00 on Saturday, May 30, 2026. It is the completed version of a science-themed sake, evolved from the previous edition released in 2022.

About “Rikei Kyodai No.54 Re”

“Rikei Kyodai No.54 Re” was born from a collaboration between “Hakui Koyori,” the researcher of the [Secret Society holoX] unit belonging to hololive, and “Rikei Kyodai,” a sake brewed by Japan’s most science-minded brewer brothers. The previous edition, “Rikei Kyodai No.54,” released in 2022, drew an exceptional response, selling out in roughly three minutes from the start of its first sale.

The latest edition is a completed version that further evolves that hit product. Based on the meticulous data accumulated by Ariga Brewery, Hakui Koyori herself once again carefully selected the sake rice and yeast. It carries an uncompromising, researcher-like update that further pursues the “dry yet fruity” flavor she considers ideal.

Who is “Hakui Koyori”?

Hakui Koyori is a VTuber with the setting of a researcher belonging to hololive’s [Secret Society holoX]. An eager, curious researcher who sometimes plays pranks just to see other people’s reactions, she is known as the self-proclaimed “brains of holoX.” She streams mainly on YouTube.

Koyori is active not only in product collaborations but also in gaming streams; in the past she has run projects such as a “Monster Hunter Stories 3” playthrough with Koyori, Luna, and Noel.

Sales schedule and what’s next

Sales start at 20:00 on Saturday, May 30, 2026, and run for a limited time until 23:59 on Sunday, June 21. However, sales may end before then once the available quantity is reached. Given that the previous edition sold out in about three minutes, an early sellout is expected this time as well.

Purchases can be made from KURAND’s product page, with shipping scheduled to begin sequentially from mid-August 2026.

Impressions and outlook

The cross-industry collaboration between a VTuber and sake is a good example of connecting oshi-katsu (fan support culture) with regional sake-brewing culture. The approach of refining the flavor by combining the brewery’s data with the performer’s own palate sets it apart from a mere character-label product. The path from the previous edition’s instant sellout to a sequel shows that fans’ passion can become a force that moves the sake-brewing floor, and it will be worth watching whether similar craft-sake collaborations continue to spread.

Source: PR TIMES