Mai Sanada was a Japanese singer, dancer, and entertainment idol who was one of two members of T-Set. Born in Osaka, she and Azusa Osawa were part of Mirei Park's Dyna Chair agency before switching to Osaka Talent after becoming dissatisfied with how Park treated them. The two bullied Park's protege Haruka Sawamura, their chief competitor in the Princess League, but Haruka defeated them, ultimately causing them to apologize for tormenting her. The three of them were later combined into a supergroup, Dream Line, for a debut performance at the Tokyo Dome, where Haruka surprised her fans by announcing her sudden retirement rather than conceal her relationship with her adoptive father, the yakuza Kazuma Kiryu.