Nao Takanashi loves her brother Shūsuke despite the incest taboo. Nao thinks that Shūsuke is her blood relative, but in fact she is an adopted daughter, whose parents have died. After Nao learns ...

The Seigaku tennis club has been invited to train at the U-17 (Under 17) camp. Seigaku is one of the 50 middle schools invited and must compete with high school players to prove they are just as good.