Mei Okada, born in Fukaya, Saitama, Japan, on 19 May 1996, is a Japanese singer, voice actress, and former idol. Okada launched her career in November 2014 as the founding leader of the Japanese idol group Tenkou Shoujo, performing with the group until her graduation in November 2019. In 2019, she joined the D4DJ franchise as the voice of Marika Mizushima in the group Merm4id, and in 2023 was cast as bass guitarist Umiri Yahata/Timoris in the BanG Dream! band Ave Mujica. As a solo recording artist under the name MEI, she released her debut digital single, “May / でしょ！”, on 26 October 2024, followed by her debut solo mini-album, Radiance, on 30 April 2025. She subsequently launched her solo live concert series, including her 1st LIVE Radiance in May 2025, her 2nd LIVE My Story Your Story in January 2026, and her live tour MEI.01 in May 2026.
