Following the name of the champion(s): Indicates the number of times the competitor has held that title at that point.
[...]
Indicates a gap in the listing where title changes are not known.
<
Title was held or changed hands no later than this. In these cases, it is known that a competitor held the title at a certain time but not when he/she won it.
@
Order uncertain. Different titleholders may be known for the same year, for example, but it is not known who held the title before whom.
#
Unofficial or disputable claims. These are usually matches that certainly took place, but where there is doubt that the competitor shown should be recognized as a true title holder. These listings are also italicized.
Japan Boxing Commission
Japanese Female Flyweight Title (as of 2025-08-31)
* Bolded letters in the competitor's name, if any, indicate the surname/family name.
Ikemoto Yumemi
2018-03-08
Tōkyō
Defeats Koseki Yūki; vacates in 18-12.
Ozawa Tamao
2019-04-14
Kyōto
Defeats Park Hye-soo; vacates in 19-09.
Hirayama Yume
2019-12-31
Tōkyō
Defeats Sayama Marina; vacates upon retirement on 21-07-19.
Hiruta Mizuki
2022-09-01
Tōkyō
Defeats Yanai Hinami; wins WBO World Junior Bantamweight Title on 22-12-01; Sayama Marina and Maeda Hōju fight for the vacant title to a draw on 23-03-30.
