is a Japanese television personality, radio personality, and model. She is a former founding member and captain of Japanese girl group Hinatazaka46 (formerly Hiragana Keyakizaka46).
Sasaki hosts the financial radio program Radionomics on the J-Wave radio station and has hosted several television variety shows. She joined Hiragana Keyakizaka46 in 2016 and was appointed its captain in 2018, and continued as captain after the group's rebranding into Hinatazaka46 in 2019 until her departure from the group in 2025. She was also an exclusive model for the fashion magazine Ray from 2019 to 2025.
Sasaki's musical career began on 11 May 2016, when she passed the auditions for new members of Keyakizaka46's subgroup Hiragana Keyakizaka46 and joined Hiragana Keyakizaka46 as the "first generation". Her first concert took place on 28 October at Akasaka Blitz, where she performed Kanji Keyakizaka46's songs "Silent Majority" and "Sekai ni wa Ai Shika Nai", as well as Hiragana Keyakizaka46's own "Hiragana Keyaki". She was a member of the subgroup's first subunit, , and was named captain of Hiragana Keyakizaka46 on a live stream on 3 June 2018. Her fandom name is .
Sasaki's first fashion show appearance was at the 27th Tokyo Girls Collection Autumn/Winter event, which took place on 1 September 2018. In February 2019, she became an exclusive model for the fashion magazine Ray.
Hiragana Keyakizaka46 was rebranded into Hinatazaka46 in March 2019, with Sasaki retaining her captaincy. She hosted the 2019 MTV Video Music Awards Japan along with fellow Hinatazaka46 members Mirei Sasaki, Nao Kosaka, and Miho Watanabe. She was the title song center (lead performer) for "Kimi wa 0 kara 1 ni nare", the main song of the group's third album (second under the Hinatazaka46 name), Myakuutsu Kanjà  (2023).
From 2020 to 2022, Sasaki co-hosted talk shows on TV Asahi and Abema such as Mieru and 2:59. She started hosting the financial radio program Radionomics on the J-Wave radio station in 2024. As a sports enthusiast, she has gone on location reporting of the annual MLB All-Star games in the United States since 2023 and participated in location reporting with TV Tokyo for the 2024 World Team Table Tennis Championships in Busan, South Korea and the 2024 Summer Olympics in Paris, France. In 2024, the baseball team Yomiuri Giants released limited edition merchandise featuring her name to commemorate her throwing out a ceremonial first pitch at their home stadium, the Tokyo Dome.
Sasaki is a fan of the manga series One Piece. In December 2020, she released an original set of stamps for the messaging application Line based on the series, as part of the "LINE Creators Collaboration x One Piece" campaign. On September 3, 2021, she also participated in a collaboration event between the series and the JAXA space agency to commemorate the series's 1000th chapter, which featured the manga characters visiting the Kibà  space module.
On 6 January 2025, Sasaki and fellow first generation members Mirei Sasaki and Mana Takase announced that they would part ways with Hinatazaka46 after the promotions for the upcoming 13th single have concluded, marking the end of the founding first generation's tenure in the group. Her "graduation" ceremony took place on 6 April at the Yokohama Stadium as part of the group's Hinatansai anniversary concert, where she named vice captain Mikuni Takahashi her successor as captain. Sasaki also ended her contract with Ray, with her final appearance in its May 2025 issue. As a solo talent, she continues to be represented by Seed & Flower, the management company under Sony Music Entertainment Japan that manages Hinatazaka46.
Sasaki's first photobook, titled , was published on 25 March 2025 by Ray publisher Shufunotomosha. It was photographed in Tokyo and Langkawi, Malaysia. It sold 16 thousand copies on its release week and topped the Oricon Photobooks charts for that week.
Sasaki appeared in the drama (2025) as supporting character Shihà  Yanagida, her first acting role outside Hinatazaka46 dramas.
In an interview with Sodane, Neru Nagahama described Sasaki as a "fun" girl who "breaks the convention" of idols and was able to bring out the hidden qualities of other members. Mirei Sasaki noted that she had been regarded as a natural leader since the group early days, making her the captain even "before she was officially appointed". Her vocal projection is frequently cited as a key element in her ability to command a concert venue and boost the morale of both the audience and her fellow members. This stage presence is supported by her technical skill in dance, which stems from years of experience in classical ballet; in an interview with Real Sound, Yà «ka Kageyama credited her with helping the other members improve their dancing.
The following are Sasaki's notable participation in Hiragana Keyakizaka46 and Hinatazaka46 discography.