Haku, or Haku Circle, is a Japanese J‑pop group formed in 2019 by four schoolmates—Ai (vocals, rhythm guitar), Mayu (drums), Kano (bass, backing vocals) and Nazuna (lead guitar)—who met in a vocational music club and later continued their education together. The band’s name, meaning “white,” reflects their aim for musical freedom, with the added period symbolizing the club origin. Their breakthrough came in 2021 with the single "Blue Girl", selected as the theme for the web drama #Seishun Kamui and winning the Grand Champion award at the BOL tournament. In 2022 they released the mini‑album 若者日記 and performed the first solo concerts in Tokyo and Osaka, while their cover of "Kamukamo‑Shikamo‑Nidomokamo" gained viral traction on TikTok and YouTube, surpassing six million views. The 2023 EP Bokura was fully produced by Kei Kono, and in 2024 they released the single "Ai!", chosen as December’s song of the month by Sina Pushu. Haku. continues to release music under Space Shower Music, with forthcoming singles "dedede" (2024) and "それしか言えない" (2025), maintaining a steady presence in the Japanese pop scene.