[9] Two months later, on 10 December 2019, Shigeoka was scheduled to face the reigning OPBF minimumweight champion Lito Dante in a six-round non-title bout.
[11] Shigeoka was scheduled to fight Ryu Horikawa for the vacant Japanese Youth light flyweight title on 11 February 2021, after a fourteen-month layoff.
[14] Shigeoka was scheduled to face the former OPBF minimumweight champion Tsubasa Koura for the vacant WBO Asia Pacific mini flyweight title on 12 November 2021.
[22] Shigeoka was expected to challenge Petchmanee CP Freshmart for the WBC mini-flyweight title on 23 April 2023, at the Yoyogi National Gymnasium in Tokyo, Japan.
[25] Shigeoka was rescheduled to face the former WBO mini flyweight champion Wilfredo Méndez for the interim WBC title instead, with the winner being designated as a mandatory challenger for Petchmanee.
[30] On March 31, 2024, in Nagoya, Japan, Shigeoka was scheduled to make the first defense of his WBC minimumweight title against Melvin Jerusalem.
[31] Shigeoka was dropped in the third and sixth rounds en route to losing a split decision to the former world champion Jerusalem.