Iwasa was born in Gifu, Japan on August 15, 2005.[1] She learned how to play shogi as a fourth-grade student due the influence of her older brothers.[2][3] She subsequently began attending a local shogi school and had become good enough to enter the Tōkai branch of the Japan Shogi Association's training group system as a fifth-grade elementary school student.
Iwasa qualified for women's professional status after being promoted to training group B2 in December 2021.[3] Needing a sponsor to become a women's professional, her first choice was shogi professional Masayuki Toyoshima.[3] A meeting between the two was arranged by a mutal acquaintance and Toyoshima agreed to take her on as his first apprentice.[3][4] She applied for women's professional status and her application was accepted by the Japan Shogi Association; she was granted women's professional status on February 1, 2022.[2] As of February 2022,[update] she is a senior high school student and Uguisudani Junior and Senior High School in Gifu.[2]
Notes: 1. No symbol denotes JSA affiliation 2. An asterisk (*) denotes LPSA affiliation 3. A cross (†) denotes unaffiliated. 4, A two-barred cross (‡) denotes a JSA apprentice school player.