Katō’s musical career began on 11 May 2016, when she passed the auditions for new members of Keyakizaka46’s subgroup Hiragana Keyakizaka46, which was hosted on the streaming platform Showroom. Katō, along with ten other people that passed the audition, joined Neru Nagahama in Hiragana Keyakizaka46 and was known as the “first generation”. Her first concert occurred on 28 October of the same year 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”.

Katō made her runway debut at the GirlsAward 2017 Autumn/Winter fashion show. On February 2019, she became an exclusive model for the fashion magazine CanCam, and appeared on the cover of the October edition with Nogizaka46 members Sayuri Matsumura and Mizuki Yamashita.