Karen entered the entertainment industry at a very young age after she was scouted in her hometown, Osaka.

[2] As a junior high school student, she moved from Osaka to Tokyo and started to live in a dormitory.

[6] On July 22, it was announced that Karen would start working as an exclusive model for JJ, also a fashion magazine, from its September issue onward.

[7] In January 2014 she made her debut as actress on the Nippon TV drama A Perfect Day for Love Letters (Koibumi Biyori).

[10][11] On December 31 in the same year, Shuuka graduated from Flower and ShuuKaRen and retired from entertainment industry.

[16] In the same year, she also starred in a special collaboration movie of Saint Laurent and i-D Japan alongside Sho Kiyohara.