[Volleyball] Sister Control's Self-Cultivation in Volleyball

[Aoba Jonishi+genius+no cp+a girl control who thinks she is not a sister control] Compared with her fraternal twin sister Amano Riko, who is known as a genius, Amano Saku is inferior to Amano Riko in every aspect. Everyone discovered that the brother and sister went to different schools after entering high school, and they speculated that the two had broken up. As everyone knows, Amano Saku enrolled in Aoba Castle just because he wanted to defeat Iwaizumi Kazuo, who was praised by his sister. Amano Saku: Sister control? How could I be a girl control? ! I just want to defeat Iwaizumi-senpai! [Ps. You Qingcheng entered the whole country twice, and my sister has CP in the extra]