Hoshimachi Suisei is a Hololive VTuber who launched her own agency Studio STELLAR in March 2026, continues group activities with Hololive, and is set to throw a ceremonial first pitch with Hatsune Miku at a Lotte Marines game on July 20, 2026.
Hoshimachi Suisei announced the launch of her personal agency Studio STELLAR during an acoustic live stream on March 22, 2026, marking her 8th anniversary and birthday. The agency manages her solo artist activities-music production, streaming, merchandise, fan club operations-in collaboration with COVER Corporation and the newly established NERD Inc., which also manages TAKU INOUE and Midnight Grand Orchestra. Suisei remains a Hololive production talent for group and collaborative work. Alongside the agency launch, she announced a 2026 arena tour titled "Once upon a Stellar" across four cities, and Midnight Grand Orchestra resumed activities with a planned second solo live concert in February 2027.
In June 2026, the Hololive unit miComet-comprising Sakura Miko and Suisei-teamed up with karaoke chain JOYSOUND for a collaboration running June 13 to July 30 at 60 stores nationwide. The collaboration includes original merchandise in two visual themes, a lottery for a newly recorded voice alarm clock, and coaster designs tied to menu orders. That same month, Lotte posted silhouette images for new Coolish and Sō ice cream commercials, with credits pointing to Suisei and Hatsune Miku. The commercials feature a song related to "blue" and were released on July 3, with the track "Ao no Sumika" by Tatsuya Kitani.
On July 9 and 10, it was confirmed that Suisei will throw the ceremonial first pitch at the July 20 Chiba Lotte Marines game against the Fukuoka SoftBank Hawks at ZOZO Marine Stadium. Hatsune Miku will appear on the stadium's video screens to cheer. The appearance is part of Lotte's sponsored game day titled "A cold, blue summer has arrived. Coolish & Sō DAY." Suisei commented, "I'll aim for a blazing fastball!!" Additional promotions include a collaboration room at Lotte City Hotel Kinshicho and a train jack on the Tokyo Metro Hibiya Line. Crypton Future Media announced the appearance.
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Hatsune Miku and Hoshimachi Suisei will appear at the ceremonial first pitch of the Chiba Lotte Marines vs. Fukuoka SoftBank Hawks game on July 20, 2026 at ZOZO Marine Stadium. The appearance is tied to a new CM for Lotte's Coolish and Sou brands, released July 3, featuring the song 'Blue's Nest' by Tatsuya Kitani with character design by Kope Nishiki. A collaboration hotel room and train jack are also planned.
Hoshimachi Suisei will throw the ceremonial first pitch at the July 20 baseball game between the Chiba Lotte Marines and Fukuoka SoftBank Hawks at ZOZO Marine Stadium. Hatsune Miku will appear on the stadium's video screens to cheer during the ceremony. The appearance is tied to a new commercial for Lotte's Coolish and Sō products, in which both sing the song "Ao no Sumika" by Tatsuya Kitani. The commercial was released on July 3. Additional promotions include a collaboration room at Lotte City Hotel Kinshicho and a train jack on the Tokyo Metro Hibiya Line. Suisei commented, "I'll aim for a blazing fastball!!" The game starts at 17:00, with doors opening at 15:00 and the first pitch scheduled around 16:40. The event is part of Lotte's sponsored game day titled "A cold, blue summer has arrived. Coolish & Sō DAY." Crypton Future Media, the company behind Hatsune Miku, announced the appearance.
The Chiba Lotte Marines will host a sponsored game day on July 20, 2026, featuring Hoshimachi Suisei and Hatsune Miku. Suisei will throw the ceremonial first pitch before the game against the Fukuoka SoftBank Hawks, while Miku will appear on the stadium vision. Suisei said she aims for a fastball and will cheer the crowd.
Lotte's Coolish and Sou ice cream brands posted silhouette images of two singing artist groups for upcoming commercials. Based on the silhouettes and credits for Studio STELLAR, Cover Corporation, and Crypton Future Media, the artists are believed to be VTuber Suisei Hoshimachi and VOCALOID Hatsune Miku. The commercials will feature songs related to 'blue'.
On June 5, 2026, Chugai Mining announced a collaboration between the Hololive unit miComet-comprising Sakura Miko and Hoshimachi Suisei-and the karaoke chain JOYSOUND. The event runs from June 13 to July 30 at 60 JOYSOUND and affiliated stores nationwide, with goods available at 20 of those locations and online. The collaboration includes new original merchandise featuring the pair in two visual themes: a stadium jacket coordination and an after-school track suit coordination. Product highlights include life-size acrylic stands (2,200 yen each), trading can badges, trading acrylic stands, acrylic art boards, a magnet can caramel with a mini can badge, flake sticker sets, and a mini tambourine. For each collaboration menu item ordered in-store, customers receive one of eight random coaster designs. Purchases of 2,000 yen or more of collaboration goods in-store earn a random postcard bonus and one entry into a lottery for a newly recorded voice alarm clock, with 100 winners selected. The alarm clock campaign is in-store only; online purchases do not include entry postcards.
Virtual idol Hoshimachi Suisei announced the launch of her personal agency, Studio STELLAR, during an acoustic live stream on March 22, marking her 8th anniversary and birthday. The new agency will manage her solo artist activities, including music production, streaming, merchandise sales, and fan club operations, in collaboration with hololive production operator COVER Corporation and the newly established NERD Inc. NERD Inc., which also manages TAKU INOUE and the group Midnight Grand Orchestra, describes itself as an independent artist agency for extraordinary talents. Suisei will continue group and collaborative activities as a hololive production talent. She also revealed a new artist photo and a logo featuring a crown-like symbol. Alongside the agency launch, Suisei announced a 2026 arena tour titled "Once upon a Stellar" across four cities: Yokohama, Kobe, Nagoya, and Fukuoka. Midnight Grand Orchestra will resume activities and hold a second solo live concert, "Project:Allegro," in February 2027.
The music project Midnight Grand Orchestra, led by VTuber Suisei Hoshimachi and sound producer TAKU INOUE, will release its first EP Travelogue I on August 19. A new artist photo and a special website were unveiled May 27. Track details remain unrevealed as production continues. The EP marks a full-scale restart ahead of the February 2027 live concert Project: Allegro.