2021年4月にビクター/スピードスターレコーズからのメジャーデビュー。海外から客演を迎えたデビューシングルを4月から3ヶ月連続で配信リリースし、同年7月にはデビューアルバム『Castle in Madness』をリリース。同年8月には日本最大級の野外フェス「FUJI ROCK FESTIVAL’21」への出演を果たし、12月にはEPリリースと共に初の東名阪ツアー“HYPER NEW-PUNK LAND”を開催し各地チケット即完。2022年8月にはアルバム『Killer in Neverland』をリリースし、作品を携えZepp DiverCity公演を含む自身最大規模の全国ツアーを開催。さらには同年12月には国内最大の年末フェス「COUNTDOWN JAPAN 22/23」への出演を果たす。また、世界最大の音楽メディア“Pitchfork media”でアルバムが評価されてインタビュー特集展開が組まれ、同サイトの年末企画「The 100 Best Songs of 2022」に「Punish」がランクイン。2023年6月28日には世界的人気を博すアニメ「コードギアス 反逆のルルーシュ」と異例のコラボレーションを始動させ、インスパイアド・アルバム『CODE GE4SS』をリリース。世界を股にかけて注目を集めている女性アーティストの一人である。


“4s4ki (pronounced ASAKI)”
A new generation of artists who are presenting new alternative pop music from Tokyo to the world. He is capable of writing lyrics, composing, and arranging music, as well as making tracks on DTM and playing the piano, all by himself, while collaborating with various musicians and creators in all directions. His lyrics, which can be described as a “record of self-love,” weave together anguish, sadness, and joy in words that are sometimes raw and realistic, and have gained sympathy mainly from people in their teens and twenties. The song has attracted a lot of attention from overseas, and has been selected for official playlists on streaming services overseas.

In April 2021, they made their major label debut with Victor/Speedstar Records. Her debut single with guest performers from abroad was released for distribution for three consecutive months starting in April, and her debut album “Castle in Madness” was released in July of the same year. In August of the same year, they performed at one of Japan’s largest outdoor festivals, “FUJI ROCK FESTIVAL’21,” and in December, along with the release of their EP, they held their first “HYPER NEW-PUNK LAND” tour in Tokyo, Nagoya, Osaka, and other locations. In August 2022, they released the album “Killer in Neverland” and held their largest national tour, including a performance at Zepp DiverCity, with the album. In December of the same year, they will perform at Japan’s largest year-end festival, “COUNTDOWN JAPAN 22/23. Pitchfork media, the world’s largest music media outlet, featured the album in a special interview, and “Punish” was ranked among “The 100 Best Songs of 2022,” a year-end project of Pitchfork media. On June 28, 2023, the band launched an unprecedented collaboration with the globally popular anime “Code Geass: Lelouch of the Rebellion” and released the inspired album “CODE GE4SS”. She is one of the female artists attracting worldwide attention.