Hoshimachi Suisei (星街すいせい) is a Japanese virtual YouTuber and singer active since 2018, known for J-pop, idol-inspired visuals, and polished live vocals. She first gained attention as an independent virtual talent before joining Hololive Production, where music-focused streams, original songs, and cover performances became central to her work.
Her catalog blends upbeat idol pop, emotional ballads, and modern production, and her star-themed persona gives her a distinct place in Japan's virtual artist scene. She is associated with the Inonaka music label, maintains an official website at hoshimachi-suisei.jp, and in March 2026 founded Studio STELLAR and released "Primadonna", marking a new phase in her career.
