Tsubaki Nagayama is a Japanese voice actress, singer, and idol, born on January 12, 2010, in Okinawa Prefecture. Her career began at a young age as a student at EXPG Okinawa, a talent school affiliated with the entertainment company LDH, which she later graduated from. She gained prominence as a member of the idol group Lucky2, joining the group upon its formation in June 2021. Her work as an entertainer also included being a regular Oha Girl on the children's television program Oha Suta from late 2021 until March 2022.

Nagayama's voice acting career is closely tied to her work with Lucky2 and the multimedia project it is associated with. Her debut voice role was as Kirari Momose in the 2021 television series Bittomo x Heroine Kirameki Powers, a live-action show in which the members of Lucky2 also starred. She subsequently voiced an animated version of herself in the short-form anime series GaruGaku II: Lucky Stars, which features the characters from the Lucky2 group and the broader Girls x Heroine franchise. This direct correlation between her role as a performer and her voice acting work represents a significant focus of her early career.