is a Japanese actress and former singer, represented by Avex. She is a former member of the girl group AKB48. As an actress, she has starred in television series such as Come Come Everybody (2021) and was nominated for Best Supporting Actress at the 61st Blue Ribbon Awards in 2019.
Kawaei auditioned for AKB48 and was selected to join the 11th generation as a kenkyà «sei (trainee) in July 2010.
In March 2012, she was promoted to Team 4, and was transferred to Team A in August. Soon after the TV series Shiritsu Bakaleya Kà Âkà  ended on June 30, it was announced that Kawaei would participate in its film adaptation. It would star several members from the groups Johnny's Jr. and AKB48.
Kawaei was a member of the AKB48 subunit Anrire with Anna Iriyama and Rena Katà Â. They appeared in Rino Sashihara's 2012 single "Ikujinashi Masquerade", which charted at number one in the Japanese Oricon weekly singles chart.
In 2013, during a broadcast of a special episode of the comedy show Mecha-Mecha Iketeru!, it was announced that Kawaei would perform as center in a song of the special unit BKA48 that will be included on AKB48's single "Sayonara Crawl" to be released in May. At the 2013 AKB48 general election, she placed 25th with 26,764 votes, and thus gained a place as an Under Girl for the next single "Koi Suru Fortune Cookie".
On May 25, 2014, during an event held at the Iwate Industry Culture & Convention Center in Takizawa, Iwate, she, along with Anna Iriyama and a staff member were attacked by a 24-year-old man wielding a handsaw, who was arrested at the scene on suspicion of attempted murder. All three victims suffered wounds including bone fractures on their fingers (reportedly, Kawaei's right thumb and Iriyama's right little finger were both fractured and cut, and the girls suffered wounds on their heads), and were taken to a hospital for surgery. The event, as well as all other group activities on that day, were halted.
At AKB48's 2014 general election she placed 16th with 39,120 votes and thus gained a place in the promotional line-up for the next single "Kokoro no Placard".
On March 26, 2015, Kawaei announced that she would leave AKB48 and transition to acting, citing her inability to participate in handshake events after the handsaw assault as the reason. She had her graduation ceremony during AKB48's Summer Concert in Saitama Super Arena on August 2 and had her last stage performance on August 4, 2015. In November 2015, it was announced that she would star with Mitsuki Takahata in the NHK morning drama Toto Neechan.
She made her debut voice role in the anime film , voicing Minifalulu, the younger sister of Falulu.
Kawaei married actor Tomoki Hirose in 2019. The couple have two children, born in November 2019 and June 2023.