Iwata was born on May 13, 1998, in Sendai, Miyagi Prefecture. Her mother is Miwa Sugawara, who works as a TV personality in Sendai. As a child, Iwata and her mother appeared in local information programs together, and musicals. Iwata has made appearances in commercials as early as 6 months of age.[2] She auditioned for AKB48, but the Tōhoku earthquake struck just before the final screening and she was affected by the disaster, so she considered withdrawing from the audition. However, the auditions were postponed, so Iwata continued to participate and was selected to join the group as a 12th kenkyusei (trainee) in April 2011.[3][4]
In December 2011, Iwata auditioned for a role in the TV animated series AKB0048 and was selected to play the main character, Nagisa Motomiya.[5] As part of the anime project, she sang with eight other AKB48 members in the subunit No Name on the show's theme songs.[6][7] In March 2012, during the Saitama Super Arena concert, Iwata was one of the trainee members who were promoted to full AKB48 members in the new Team 4. She also participated on her first A-side, on the AKB48 single Manatsu no Sounds Good!.[8] In July 2012, Iwata was selected to host a TV program on NHK as part of a series to support the areas affected by the 2011 Tōhoku earthquake and tsunami, which included Sendai. She mentioned that she had lived in a shelter for a while before auditioning for AKB48.[4] On August 24, 2012, AKB48 had a major restructuring, in which Team 4 was dissolved, and Iwata was moved to Team A.[9][10]
On January 5, 2016, Iwata announced she would be leaving the group.[11] AKB48 held her graduation events for Iwata in March 2016.[12]
Just before graduating from AKB48, she moved to the Japanese major talent agency Horipro.[12] She has appeared in numerous stage productions, musicals, films and TV dramas, as well as appearing in concerts organised by Horipro, performing songs and dances from her AKB48 days. In June 2021, she appeared in a concert to celebrate the 10th anniversary of the 12th generation of AKB48, her first appearance in five years at an AKB48 theatre.[13] She played the role of Delphi Diggory in Harry Potter and the Cursed Child in Tokyo from June 2022 to May 2023.[14]
She appeared as the lead actress in The Last Passenger, a film about the Tōhoku earthquake, for which she won the Best Actress Award at the Global Nonviolent Film Festival (2023). This was her first personal award in the field of acting.[15]
Originally, she wanted to be an actress and dreamed of performing in musicals, especially on Broadway.[15] After appearing on the Harry Potter stage, she began to study English again, and in 2024 she obtained a United States O-1B Visa and began her studies in New York City in June.[16] In order to prepare for her studies in the U.S., she left Horipro at the end of June 2023, after which she is working on a freelance basis.[17]
Iwata attended the Faculty of Arts at Nihon University and graduated from Department of Photography in March 2023.[18]
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