Dave Meltzer of the Wrestling Observer Newsletter has called Iwatani and fellow Japanese workers Io Shirai and Kairi Hojo "three of the best wrestlers in the world".

She contacted Fuka, the general manager of the World Wonder Ring Stardom promotion, who were looking for new wrestlers, and eventually moved to Tokyo in 2010 to pursue a career in professional wrestling.

[2] She made her professional wrestling debut at Stardom's inaugural event on January 23, 2011, facing fellow debutante Arisa Hoshiki.

[27] After a record-setting eight-month reign, Tawashis lost the Artist of Stardom Championship to Hatsuhinode Kamen, Kaori Yoneyama & Tsubasa Kuragaki on August 10, 2014.

[33] On May 6, Iwatani & Io Shirai, Thunder Rock, defeated Chelsea & Kairi Hojo to win the vacant Goddesses of Stardom Championship.

[37] In April, Iwatani, along with Hojo & Shirai, traveled to the United States to take part in events held by Lucha Underground and Vendetta Pro Wrestling.

[43][44] On November 11, 2016, both Thunder Rock and Threedom were dissolved, when Shirai turned on Iwatani, after the two had lost to Hojo & Yoko Bito in the finals of the 2016 Goddesses of Stardom Tag League.

[50] After nine successful title defenses, Iwatani lost the High Speed Championship to Kris Wolf in a three-way match, also involving Kagetsu, on February 23, 2017.

[54] Shortly afterwards, it was reported that Iwatani was no longer considering retirement and was being positioned as Stardom's top star in the wake of Io Shirai and Kairi Hojo's departures from the promotion.

[64] On February 18, 2018, Iwatani & Tam Nakano challenged Oedo Tai (Hana Kimura & Kagetsu) for the Goddesses of Stardom Championship but were unsuccessful.

[68] On September 30, at the afternoon show of 5★Star Grand Champion Carnival, Iwatani won the Artist of Stardom Championship with Kashima & Nakano after defeating J.A.N.

[70] On December 15, Iwatani tore her MCL in an Artist of Stardom Championship defense against Queen's Quest (Konami, Momo Watanabe and Utami Hayashishita).

[73] On May 16, 2019, Stars (Iwatani, Tam Nakano & Saki Kashima) lost the Artist of Stardom Championship to Tokyo Cyber Squad (Hana Kimura, Jungle Kyona & Konami).

[76] At Stardom Cinderella Tournament 2020, Iwatani wrestled Hana Kimura into a time-limit draw during the first-round matches from March 24.

[81] Iwatani teamed up with Koguma at Yokohama Dream Cinderella 2021 in Summer on July 4, 2021, where they unsuccessfully challenged Syuri & Giulia for the Goddesses of Stardom Championship.

[84] At Osaka Super Wars from December 18, Iwatani teamed up with Hazuki & Koguma and took part in a ¥10 Million Unit Tournament which was also contested for the Artist of Stardom Championship by first defeating Cosmic Angels (Tam Nakano, Mina Shirakawa & Unagi Sayaka) in the semi-finals, and eventually falling short to the champions MaiHimePoi (Maika, Natsupoi & Himeka) in the finals on the same night as a result of a Six-Woman Tag Team ladder match.

[86] On the first night of the Stardom World Climax 2022 from March 26, Iwatani teamed up with Kairi to defeat Tam Nakano & Unagi Sayaka.

[89] At Stardom Golden Week Fight Tour on May 5, 2022, Iwatani defeated Thekla to win the SWA World Championship.

[97] On January 4, 2020, Iwatani along with Arisa Hoshiki, Giulia and Hana Kimura made their debut in New Japan Pro-Wrestling at Wrestle Kingdom 14 in Tokyo Dome in a special Stardom tag team exhibition match.

[98] Iwatani continued to work in these kinds of matches, making her next appearance at Wrestle Kingdom 15 on January 5, 2021, where she teamed up with Tam Nakano and fell short to Donna Del Mondo's Syuri and Giulia.

[100] On October 28, at Rumble on 44th Street, Iwatani successfully defended the SWA World Championship against KiLynn King, being the first to defense a Stardom title in NJPW.