At 2AW Grand Slam in TKP Garden City Chiba, an event produced by Active Advance Pro Wrestling on November 14, 2021, she teamed up with Tsukushi to defeat Ayame Sasamura and Rina Shingaki.

on February 21, 2022, she teamed up with Hiroyo Matsumoto and Itsuki Aoki to defeat Ayame Sasamura, Makoto and Riko Kaiju.

[6] Mashiro made her professional wrestling debut at New Ice Ribbon #985 on August 17, 2019, under the name of White in an exhibition match where she fell short to Totoro Satsuki.

[7] Shortly after her debut, she competed in Tequila Saya's retirement match from New Ice Ribbon #1013/RibbonMania 2019 on December 31, a 44-person gauntlet match in which Saya faced the likes of Mashiro, Syuri, Momo Kohgo, Matsuya Uno, Ken Ohka, Lingerie Muto and many others into a draw.

[8] At Ice Ribbon/AWG Ice Ribbon and Actwres girl'Z Joint Show on November 16, 2020, Mashiro competed in a 6-on-2 handicap match where she teamed up with Ayumi Hayashi, Momo Tani, Rina Amikura, Yappy and Yoshiko Hasegawa to defeat Hamuko Hoshi and Tsukasa Fujimoto.