Hoshimachi Suisei and Hatsune Miku Duet in Lotte Coolish × Sō TVCM
This marks the first time Lotte's two ice cream brands have collaborated on a single commercial, and the pairing of a top VTuber with Hatsune Miku signals a growing mainstream acceptance of virtual performers in national advertising campaigns.
Reporting from 2 sources: PANORA, Anime Anime.
Virtual idol Hoshimachi Suisei will appear in Lotte's first joint TV commercial for its Coolish and Sō ice cream brands, performing Tatsuya Kitani's "Aon no Sumika" in a duet with virtual singer Hatsune Miku. The commercial, titled "Tsumetakute Aoi, Natsu ga Kita" ("Cold and Blue, Summer Has Come"), will air nationwide in Japan starting July 7, 2026. A 90-second video blending live-action and animation was pre-released on YouTube on July 3. The character designs were drawn by illustrator Niiro Kope, who has designed for games and major agency VTubers. Alongside the commercial, Lotte is running multiple campaigns: an online shop lottery for original pin badges (100 winners), a Coolish X (Twitter) follow-and-repost campaign for B2 posters (20 winners), a collaboration hotel room at Lotte City Hotel Kinshicho (stays from July 5 to September 27), and a train jack on the Tokyo Metro Hibiya Line (July 13 to 27). Hoshimachi Suisei will also throw the ceremonial first pitch at a Chiba Lotte Marines game on July 20.
Hoshimachi Suisei and Hatsune Miku duet on Tatsuya Kitani's "Aon no Sumika" (lyrics and music by Kitani) in the commercial, which uses the color blue as the common brand color of Coolish and Sō. The 90-second video was pre-released on YouTube on July 3, alongside 30-second and 15-second versions. The character designs are by illustrator Niiro Kope, who has designed characters for games and major agency VTubers.
In a statement, Hoshimachi Suisei said: "I'm so happy to appear in a CM with Miku-chan, whom I've known for a long time! Besides the TVCM, there are many other projects like the train jack and hotel collaboration. The CM is so refreshing that it makes you want to run out under the blue sky."
Niiro Kope said: "When I was a student doing sports in club activities and lessons, I relied on Coolish and Sō in summer. I especially remember using Coolish as a cooling item until it softened. When I did kendo in club activities, that cool feeling was great."
The commercial's story follows a sun-scorched classroom where the two characters arrive with Coolish and Sō in hand, bringing a rush of coolness. The collaboration hotel room at Lotte City Hotel Kinshicho includes a dedicated freezer stocked with 10 varieties of Coolish and Sō, plus take-home room keys, original stickers, and a Coolish-shaped ice pack. The train jack on the Tokyo Metro Hibiya Line will wrap one train set entirely in blue visuals of the two characters.
Synthesized by Yomimono from the 2 cited sources below, including Japanese-language reporting where cited, then editorially reviewed before publishing.