Their roster is predominantly made up of outside talent from other promotions such as Ice Ribbon, Gatoh Move Pro Wrestling and World Woman Pro-Wrestling Diana, as well as veterans and freelancers.

After 5 years with World Wonder Ring Stardom, founder Nanae Takahashi left the promotion in the wake of the in-ring incident between Yoshiko and Act Yasukawa.

[3][4][2] In February 2016, Yoshiko Hirano, a trainee of both Takahashi and Taiyo who retired from pro wrestling in 2015 following a legitimate in-ring incident with fellow wrestler Act Yasukawa, announced she would be coming out of retirement to compete for Seadlinnng.

This partnership lead to American wrestlers such as ODB and Veda Scott competing in Sead.

[6] In January 2017, the promotion gained another signed wrestler in Arisa Nakajima, who had resigned from JWP the previous month.