Natsusa Yuzuki entered university expecting to be the rugby club's ace, but he can no longer play rugby due to certain circumstances. Ibuki Ueoka is a senior who also quit playing rugby. Yasunari Tsuru is Natsusa's junior who finds him disagreeable. Yuu Mashiro is another junior who looks up to Natsusa. Seiichirou Shingyouji is Natsusa's childhood best friend. Together, they compete in the Kansai university rugby league.