Sasaki Mirei is a member of Hinatazaka46's 1st Generation. She is a "non-no" exclusive model.
- Re:Mind (2017)
- DASADA (2020)
- Japan Women's Gourmet Burger Club (女子グルメバーガー部) (2020)
- Kakegurui Twin (賭ケグルイ双) (2021)
- Koeharu! (声春っ!) (2021) – Hinowa Meiko
- Hiragana Oshi (2018 – 2019)
- HINABINGO! (2019)
- Hinatazaka de Aimashou (日向坂で会いましょう) (2019 - )
- ZIP! Fashion News Kiterune! (2020 - ) - Irregular Reporter
- Hinatazaka46 desu. Chotto Ii Desu Ka? (日向坂46です。ちょっといいですか？) (2020 - )
- Keyakizaka46 no All Night Nippon (けやき坂46のオールナイトニッポン) (2018)
- Hinatazaka46 no All Night Nippon GOLD (日向坂46のオールナイトニッポンGOLD) (2019)
- Hinatazaka46 no All Night Nippon 0(ZERO) (日向坂46のオールナイトニッポン0(ZERO)) (2019 – )
- Former member of Kansai young-teen idol group choco☆milQ
- Has lived in Taiwan and speaks some Chinese
- Appeared on a local news broadcast in Taiwan after an earthquake struck her area. She said she escaped from her house with a single pair of pants
- She was born in Kanagawa, but currently lives in Hyogo
- Starred in Aimer's music video "Hanabiratachi no machi"
- As of March 25, 2020, she is the reporter for the corner "Fashion News Kiterune!" of the Nippon TV program "ZIP!" alongside former SKE48 member Goto Rara.
- The "mother" of Miipan Family, a unit consisting of herself, Hamagishi Hiyori, Kawata Hina, and Yamaguchi Haruyo. The four have a LINE group together, and Mirei is known for being motherly towards the others.
- She is particularly close with Hamagishi Hiyori. On a segment on HINABINGO!, she chose Hiyori as her ideal little sister and Hiyori chose her as her ideal big sister
- She often texted Hiyori while Hiyori was on hiatus. Hiyori claims that if Mirei had not reached out to her so often, she may have decided to graduate from Hinatazaka46
- Mirei once borrowed a manga from Hiyori and returned it with a stick of Mintia gum. She had been using the stick of gum as a bookmark
- Shares a family name with Sasaki Kumi. Audrey's Wakabayashi, one of the hosts of Hiragana Oshi and Hinatazaka de Aimashou called them by similar names (Sasami and Sasaku)
- Can play the violin.
- Tested positive for COVID-19 on April 5, 2022