Born on 16 May 1995 in Ibaraki Prefecture, Watanabe passed first generation member audition of Keyakizaka46 on August 21, 2015, and started her activities.
[6] On 6 May 2017, she made her runway debut at the fashion and music event GirlsAward 2017 SPRING ／ SUMMER, held at the Yoyogi National Gymnasium.
[7] She is also part of the subgroup Aozora to Marry (青空とMARRY) along with Risa Watanabe, Akane Moriya, Yūka Sugai and Manaka Shida.
As part of the subunit, Watanabe made appearances in three songs: "Aozora Chigau" in "Sekai ni wa Ai Shika Nai", "Wareta Sumaho" in "Fukyōwaon, and "Namiuchigiwa o Hashiranai ka?"
[14] She is shy and clumsy, and her treasure Whale Shark Plush "AOKO"[15] of Okinawa Churaumi Aquarium is popular among the fans.