大きい女の子は好きですか？

Tachibana Shouta is a freeter with no obvious goal or dreams in life. One day, he is dragged out by her older sister Kaoru to manage her University's woman volleyball club, which was on the verge of abolition. Among all these big girls is also Shouta's first love, Ayano Hasegawa. As all the girls in the volleyball team approach Shouta, Kaoru starts to realize her forbidden love for her younger brother. But, amidst all of this, Shouta aims to bring the volleyball club together and win the prefectural tournament.