Cocona Umeyama was a member of the girl group, NMB48, as a member of their 5th generation. She was also a member of the units Mix Juice and LAPIS ARCH.

Cocona joined NMB48 as a Kenkyuusei on June 28, 2016, and was later promoted to Team N on October 12, 2017, during the final of NMB48’s Arena Tour 2017. In 2019, she was transferred to Team BII. This became her last transfer before the reformation of NMB48 on January 21, 2021. She was later transferred to Team M after the reformation of their teams.

Cocona has become one of NMB48’s popular members starring in 9 of their A-sides(as of 2022), with her playing as the center with Yamamoto Ayaka in Datte Datte Datte.

On January 5, 2022, she announced her graduation from NMB48 with her last single being Koi to Ai no Sono Aida ni wa. She officially graduated on March 26, 2022.