[5] Morimoto made her professional debut against a fellow debutante Koto Hiroaka at Krush 58 on 12 September 2015.
[6] Morimoto was scheduled to face the #5 ranked J-Girls mini-flyweight Miyako Mitsuhori at Krush 60 on 14 November 2015.
[15] Morimoto made her second title defense against Kai Ting Chuang at Krush 69 on 30 September 2016.
[17] Morimoto was scheduled to face the former WBC Muaythai International Super Flyweight champion Grace Spicer at Krush 76 on 28 May 2017.
[18] Morimoto was scheduled to face the incumbent ISKA World Atomweight Full Contact champion Emilie Machut at Krush 79 on 20 August 2017.
In preparation for the bout, Morimoto trained with the reigning WBA and WBO world champion Naoko Fujioka.
Morimoto scored the sole knockdown of the fight at the very end of the second round, dropping Petukhova with a head kick.
[25] Morimoto was scheduled to make her second title defense against Liu Shibei in the main event of Krush 92 on 18 August 2018.
[29] During the post-fight press conference, Morimoto revealed that she had suffered a bicep tear, in her right arm, during the second round.
She was scheduled to face the reigning ISKA atomweight and Enfusion 52 kg champion Cristina Morales in the tournament semifinals.
[46] Morimoto faced the former Enfusion and WAKO champion Aurore Dos Santos in a non-title bout at K-1 World GP 2022 in Osaka on December 3, 2022.
[47] She won the fight by first-round technical knockout, as she stopped Dos Santos with a flurry of punches with just five seconds left in the opening frame.
[50] On May 25, 2023, K-1 announced that Morimoto would make her third flyweight championship defense against Amy Pirnie at K-1 World GP 2023 on July 17, 2023.
[51] That same day, Pirnie released a statement on her Instagram profile claiming that she was still in negotiations with the promotion at the time the bout was announced and would be withdrawing from them due to the perceived bad treatment.
[54] Morimoto was scheduled to make the fourth defense of her K-1 Women's Flyweight (-52kg) Championship at K-1 ReBIRTH 2 on December 9, 2023, against WKU world champion Antonia Prifti.