A story about Ryoma's childhood friend, The Kunoichi of Tennis. Join the ninja in her life that involves our most arrogant prince of tennis.

No one actually understands why Echizen Ryoma refused to be a pro.

Echizen Akia and Akiko, older twin sisters of Echizen Ryoma, despite being twins, are very different from each other. Everything from the way they look, to the way they dress, and to the person they fall for. Despite being so different, they get along very well and always help each other out, while taking care, in their own way, of their dear younger brother. Follows main story.