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Ai Kago (Jia Hu  Ya Yi , Kago Ai), born February 7, 1988 in Yamatotokada, Nara, Japan, is a Japanese singer, actress, author, and former Guinness World Record holder. Kago began her career at the age of 12 as a member of the idol group Morning Musume. In the same year, she became a founding member of Minimoni.

Throughout the second half of 2010, Kago became unhappy with the direction of her work. Around the same time, she began dating restaurant owner Haruhiko Ando, who acted as an in-between for her agency and herself. Since beginning a relationship with Ando, Kago cancelled several jobs at the last minute, causing her agency to suspend her activities. Despite this, she participated in a live performance and opened a separate blog without permission.  Kago parted ways with R&A Promotions in November 2010 despite her contract ending in March 2013. As a response, in 2011, Kazuyuki Ito, president of Mainstream (an associate of R&A Promotions), declared that the agency planned on suing for 100 million yen in damages for contract violations. During that time, Kago's career was also derailed by her personal life. In September 2011, Ando was arrested for alleged extortion and claiming to have connections with the yakuza. In the same month, Kago was rushed to a nearby hospital after agency officials found her on the floor of her apartment with cuts to her wrists. Her life was reported to be not in danger, though there were speculations that it was a planned suicide. Following the incident, she and Ando registered their marriage, and Kago became pregnant.  After spending 2012 out of the public eye with the birth of her daughter, Minami, Kago transferred to a new agency in 2013. Planning to revive her music career, she formed an idol group, which was later named Girls Beat!! The group would be crowd-sourced using lyrics, music, and costume ideas submitted by fans. Remi Kita and Ryona Himeno were recruited as the other two members after passing the auditions.  Girls Beat!! released their first single, "Sekai Seifuku" on July 22, 2014. Their activities were abruptly put on hold when an arrest warrant was put out for Ando in October on suspicions of loaning money at illegal interest rates. Kago later filed for divorce, planning to continue activities once the divorce was finalized. Although Kago was eventually successful in doing so, in August 2015, her contract with her agency expired, though she continued activities with Girls Beat!! in November. On February 29, 2016, she graduated from the group.
Ai Kago