[5] During her time at Hiragana Keyakizaka46, Saitō participated in every single between "Sekai ni wa Ai Shika Nai" and "Kuroi Hitsuji".

She is the center (lead performer) for the song "Soredemo Aruiteru", a B-side for the single "Kaze ni Fukarete mo",[6] and performed a solo song on the group's first album Hashiridasu Shunkan, titled "Igokochiwaruku Otona ni natta" (居心地悪く大人になった, lit.

[7] In June 2020, Saitō announced that the name of her fandom would be Kyonkois (きょんこいず, Kyonkoizu), a combination between her nickname Kyonko and "love" (恋, koi).

[16] The main song, written by Hinatazaka46 lyricist Yasushi Akimoto, was first revealed live on Music Station Superlive 2023 on December 22, 2023.

[20][21] Her final participation on a Hinatazaka46 music release was for the 11th single, "Kimi wa Honeydew", serving as the center for the B-side "Boku ni Tsuzuke" (僕に続け, lit.

[23] Saitō's solo photobook, titled Totteoki no Koibito (とっておきの恋人, Special Lover), was released on January 19, 2021.

[31] In 2019, Saitō played high school student Wakame Isono in the stage adaptation of the manga Sazae-san, which ran from September to October.

[32] In May 2024, after her departure from Hinatazaka46, Saitō announced that she has signed with the Toho Entertainment talent agency and intended to further pursue acting.

[38] In 2023, the cup noodle brand CupStar, in whose commercials Hinatazaka46 had previously appeared, released a Hidakaya Jjigae Miso Ramen limited edition product, with Saitō's likeness featured on the lid.

[43] Since then, live events based on the show have been held in 2022 at the EX Theater Roppongi[44] and in 2023 at the Tokyo International Forum, Hall A.