Yoshiko's reign ended in controversy in February 2015, when she went off script during a match with Act Yasukawa, legitimately beating and injuring her.

She was trained by Fuka Kakimoto alongside the likes of Eri Susa, Mayu Iwatani, Yoko Bito and Yuzuki Aikawa as part of Stardom's first class of trainees.

[16][17] After three successful title defenses, Yoshiko and Taiyo lost the Goddesses of Stardom Championship to former stablemate Kyoko Kimura and Hailey Hatred on March 17.

[20] On October 17, Yoshiko took part in a sixteen-woman elimination tag team match, promoted by Sendai Girls' Pro Wrestling.

Yoshiko won the match for the younger generation by scoring the final elimination over Sendai Girls' founder Meiko Satomura.

[22] On the road to her retirement, Taiyo was defeated by Yoshiko on March 16 in what was billed as the final match between the teacher and student pairing.

[38][39] Yasukawa eventually returned to the ring on September 23, 2015,[40][41] but retired the following December due to the damage inflicted on her eye in the incident with Yoshiko.

[44] On February 11, Seadlinnng officially announced that Yoshiko (now with a revised ring name) had joined the promotion and would be returning to wrestling full-time.

[46] Afterwards, Yoshiko also began making appearances outside of Seadlinnng, working for Sendai Girls' Pro Wrestling on April 8,[47] World Woman Pro-Wrestling Diana on May 5,[48] and participating in Pro Wrestling Wave's 2016 Catch the Wave tournament between April 10 and June 5, making it to the semifinals, before losing to eventual tournament winner Ryo Mizunami.

[52][53] On July 25, 2018, Yoshiko and Rina Yamashita became the first Seadlinnng Beyond the Sea Tag Team Champions, defeating Nanae Takahashi and Tsukasa Fujimoto.

After five and a half years since leaving Stardom, Yoshiko alongside Nanae Takahashi, made their surprise return where they confronted Mayu Iwatani, Momo Watanabe, Starlight Kid and Saya Iida.