As a freelancer, Shimizu is known for competing in various promotions. At AJPW GROWIN' UP Vol.3, an event promoted by All Japan Pro Wrestling on June 7, 2017, she teamed up with Natsumi Maki in a losing effort to Saori Anou and Miyuki Takase.[5] At DDT Ganbare Pro A Walk In The Park 2018, an event promoted by the GanPro branch of DDT Pro Wrestling on March 21, 2018, she faced Saki in a losing effort.[6] At Odate Wrestling Festival, an event promoted by Pro Wrestling Freedoms on September 22, 2018, Shimizu teamed up with Nao Kakuta in a losing effort to Yuna Manase and Mari.[7] At SEAdLINNNG Sparkling-d!, an event promoted by Seadlinnng on December 13, 2018, she faced Asuka and Chikayo Nagashima in a three-way match.[8]
At Stardom New Blood 2 on May 13, 2022, after Shimizu's Color's unit stablemates Rina Amikura and Yuko Sakurai picked up a win over Stars members Saya Iida and Momo Kohgo, Tam Nakano rushed to the ring to confront the rest of the Color's members, They set a six-man tag team match for a show on June 5.[14] At Stardom in Korakuen Hall on June 5, 2022, Shimizu teamed up with her Color's stablemates Saki and Yuko Sakurai to fall short to Cosmic Angels'Unagi Sayaka, Tam Nakano and Mina Shirakawa in a loser joins enemy unit. Subsequently, Shimizu, Saki and Sakurai joined Cosmic Angels and announced that they will compete as a sub-unit in the future.[15]