 The reasoning for the name was a combination between seedling, symbolising the new promotion, and "to cross the sea".The promotion's debut show, "Let's Get Started", took place on August 26, 2015 in Korakuen Hall.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.