川島 雪舞

The daugther of Kyouko and a first year highschool student.
She is a member of the calligraphy club, and she is good enough to participate in the national competition.

Yuma knows Keito since their childhood and she admires him for a long time. Thats why she wants to become his Nr.1 Imouto. 
She is one of the most popular girls in her school but Yuma is so devoted to Keito that she is completely oblivious to the eyes of the boys in her school.