Yunoki Mio while active as tennis club member and serving as the student chairman in a private girls school. Ayukawa Rinka of childhood friend who is aiming at professional tennis player and cousin younger sister Ikoma Yui, junior Asahina Konomi from student association that admire me, good times is spent busy.

Parents both in the doctor, want to advance Mio to the field of medicine in the future. Parents are acting around foreign countries, to the house though it doesn't come back, it was not lonely because there was maid Toya Shiori of living in at home. It loves with Shiori like sisters each other, the relation like the family.

Such companions while being enclosed, Mio that sends study campus life enhanced with sports, a certain day abruptly, the misfortune unexpected falls...