Do you know what it is like to be in the shadows never taking any credit being forgotten because there is some one better than you, if so then maybe you will understand.
Yukimura Seira, the child of god's twin sister younger than him by 3 minutes but still she is lost in his title. Though she doesn't play tennis by her name she still plays under an alias that alias is Radiant Shadow. She keeps another secret though at her school she is an average student under the name Shadō Seira.
When she was 8 she ran away from her family and moved to Tokyo for her first year of middle school but a year later she was dragged back to Kanagawa to attend Rikkia Dai. In second year she kept low and planned to do the same in third but a single encounter may change everything.
Her first alias Radiant Shadow is actually the current victor of all of the Grand Slams and has been since she first turned six. The only problem with keeping up the facade was in second year to get away for the tournament now she has to keep it a secret from her family no matter what afterall she isn't the one known for tennis.