Camellia Factory participant Hello Pro Kenshūsei
2015–16: Indies and New Members
On September 6, 2015, Tsubaki Factory released their first indie single "Seishun Manmannaka!".On December 31, Tsubaki Factory released their second indie single "Kedakaku Sakihokore!".On May 18, 2016, Tsubaki Factory released their first extended play, Tsubaki Factory Sound + Vision Vol.1.On August 13, it was announced at a Tsubaki Factory fan club event that Hello Pro Kenshuusei members Mizuho Ono, Saori Onoda, and Mao Akiyama had joined the group as new members. The new nine-member line-up debuted on September 4 at Hello! Project Kenshūsei Happyōkai 2016 9gatsu ~Singing!~, where it was announced by Hello! Project advisor Shimizu Saki that Tsubaki Factory would finally make their major debut in January 2017.