[2] Sugawara made her professional debut against the more experienced, but winless, Satomi Toyoshima at Krush 97 on January 26, 2019.
[4] Sugawara next faced the 2018 K-1 All Japan Amateur tournament winner Michiko Nobutani, who was making her professional debut, at K-1 KRUSH FIGHT 100 on April 19, 2019.
After suffering her first loss, Sugawara faced the unbeaten Chan Lee at K-1 KRUSH FIGHT 103 on July 21, 2019.
[9] On June 17, 2020, it was announced that a Krush atomweight tournament would be held to crown a new champion, as the title was left vacant after Miho Takanashi moved up in weight.
[10] Sugawara faced Yu Fukuhara in the tournament semifinal, while the other bracket pitted Moe Takahashi against Chan Lee.
[12] Sugawara faced Moe Takahashi in the tournament final, which was scheduled as the co-main event of Krush 119 on November 27, 2020.
[16] Sugawara faced the four-time Shoot Boxing tournament winner Mio Tsumura at K-1 World GP 2020 in Osaka on May 29, 2021, in her second K-1 appearance.
[22] Sugawara made her second title defense against Yu Fukuhara in the co-main event of Krush 134 on February 20, 2022.
The one-day four-women tournament was held at K-1: Ring of Venus on June 25, 2022, at the Yoyogi National Gymnasium in Tokyo, Japan.
[30] Sugawara challenged the K-1 Women's Atomweight champion Phayahong Ayothayafightgym at K-1 World GP 2023: K'Festa 6 on March 12, 2023.
The title bout was a rematch of their 2021 K-1 Atomweight Grand Prix finals meeting, which Sugawara lost by split decision, after an extension round was contested.