The brothers were scheduled to face each other in the final of a domestic tournament but agreed not to fight, with Ginjiro's corner throwing in the towel as the bell rang to signal the start of the first round.
[5] Shigeoka was scheduled to face Clyde Azarcon for the vacant World Boxing Organisation Asia Pacific Minimumweight title on July 27, 2019.
[7] Shigeoka was scheduled to make his second title defense, following a 19-month absence from the sport, against the undefeated Toshiki Kawamitsu on July 14, 2021, in his first career main event.
[9] Shigeoka was booked to face Tatsuro Nakashima on March 27, 2022, at the City Gym in Tomigusuku, Japan,[10] for the vacant Japanese minimumweight title.
[16] The fight was stopped at the 2:48 minute mark of the third round, after an accidental headbutt left the champion unable to continue competing.
[17] Event organizer Kōki Kameda stated during the post-fight press conference that he would try to arrange a rematch for the April of the same year.
[20] On June 30, 2023, it was announced that Shigeoka would rematch the IBF mini flyweight champion Daniel Valladares in a title consolidation bout on August 11, 2023.
[26] Kameda Promotions were contacted by the Philippines's Games and Amusement Board on March 26, 2024, who informed them that Andales would be withdrawing from the contest due to a weight-cut induced hypoglycemia.
[27] Andales was replaced by Jake Amparo, ranked at the time as the sixth-best mini-flyweight by the IBF, who stepped in on a five-day's notice.
[30][31][32] Shigeoka lost his title to former champion Pedro Taduran at the Shiga Daihatsu Arena in Otsu, Japan, on 28 July 2024, via ninth-round stoppage.