is a Japanese professional boxer who held the IBF female atomweight title from 12 January 2024 to 5 April 2025.
Yamanaka made her professional boxing debut on 13 December 2020, scoring a unanimous decision win over Arika Shimono at Edion Arena in Osaka.
She won the vacant WBO Asia Pacific 102-pound belt by stopping Honoka Kano in the fifth round of their bout at Tokyo's Korakuen Hall on 1 September 2022.
On 12 January 2024, Yamanaka captured the IBF female atomweight title with a unanimous decision success against defending champion Mika Iwakawa also at Korakuen Hall.
Yamanaka was scheduled to make the first defense of her title against former WBC female atomweight World champion Fabiana Bytyqi at Olympiastuetzpunkt, Heidelberg in Germany on 23 November 2024. The bout was cancelled after Bytyqi collapsed due to dehydration on the day of the weigh-in.
She faced WBC, WBA and WBO female atomweight title holder Tina Rupprecht in a contest to crown an undisputed champion for the division at the MBS Arena in Potsdam, Germany, on 5 April 2025. Yamanaka lost by majority decision with two of the ringside judges scoring the contest 99âÂÂ91 and 96âÂÂ95 respectively for her opponent, while the third had it a 95âÂÂ95 draw.
Sumire is the younger sister of former WBO mini-flyweight world champion Ryuya Yamanaka.