Koyori Hakui Stars In And Supervises Novel Game Koyorium
Entergram is treating supervision as involvement from the planning stage onward, letting the performer shape the setting and story rather than signing off on a finished product, which the company says is now its standard approach to VTuber-led titles.
Key Facts
- Entergram published the teaser site for the novel game Koyorium on September 17, 2026.
- Koyorium stars and is supervised by hololive VTuber Koyori Hakui, a member of the sixth-generation unit Secret Society holoX.
- Koyorium is exhibited at the Entergram booth in Hall 3, stand 03-N05, at Tokyo Game Show 2026, held at Makuhari Messe from September 17 to 21.
- Supported platforms, release date, price, and story details for Koyorium are unannounced.
- The Koyorium teaser site is scheduled to open as the official site on October 22, 2026.
Reporting from 3 sources: 4Gamer.net, Inside, Game Spark.
Entergram published a teaser site on September 17 for Koyorium, a novel game starring and supervised by hololive VTuber Koyori Hakui. Hakui is part of the hololive sixth-generation unit Secret Society holoX, where she appears as a researcher. The game is on display at the Entergram booth in Hall 3, stand 03-N05, at Tokyo Game Show 2026, which runs at Makuhari Messe from September 17 to 21. The booth shows a large key visual, a standee bearing a handwritten signature, and a message video from Hakui. Visitors who photograph the key visual or standee, post the image with the hashtag Koyorium, and show the screen to booth staff receive a key visual sticker while the daily supply lasts. Supported platforms, release date, price, and story details are unannounced. The teaser site is scheduled to open as the official site on October 22, with updates promised via Entergram's website and its official X account.
Koyorium is Entergram's fourth novel game built around a hololive talent, after Aquarium with Minato Aqua and two titles starring Nekomata Okayu.
Hakui plays a researcher in the sixth-generation unit Secret Society holoX. The new costume drawn for the game reads to her like a school uniform, and the venue material has fed fan speculation that the story is school-themed. The title comes from a word used in her streams, described as a kind of nutrient fans receive from her, and it carries the sense of supplying energy. An original song, Shiawase√Koyorinium, was released under that name in 2024.
In the booth message video she reacted with open joy and thanked Entergram for making a long-held dream come true. On supervision, Entergram said the two sides check with each other on whether the work is heading in the direction the performer wants, starting from the planning stage, where the setting and the shape of the story were left to her.
Synthesized by Yomimono from the 3 cited sources below, including Japanese-language reporting where cited, then editorially reviewed before publishing.