[4][5] However, she did not have to wait long to get her hands on a global belt as she won the WBC female minimumweight World title on 17 May 2014, beating defending champion Mari Ando by unanimous decision at Azalea Taisho, Osaka, Japan.
[6][7] After five successful defenses, she lost her title on 17 December 2017, to Momo Koseki slipping to a unanimous decision defeat at Kyuden Gym, Fukuoka, Japan.
[8][9] Moving down a weight division, Kuroki faced Saemi Hanagata at Korakuen Hall on 29 September 2018, with the vacant IBF female atomweight World title on the line.
[10][11] Kuroki claimed the WBO female atomweight World title on 1 September 2022, winning via unanimous decision against Nanae Suzuki at Korakuen Hall.
[14] [15] On 5 August 2023, Kuroki became a unified World champion when she defeated WBA female atomweight title holder Monserrat Alarcón by majority decision at Central Gym, Kobe, Japan.