Nara, who has struggled to feel love since school, starts dating Yuki, who is 3 years younger than her. Yuki is a volleyball athlete and he is a member of the Japan Men's National Volleyball Team. But unexpectedly, Nara meets someone from her past while watching Yuki's match. Nara's heart is still beating fast when she sees it.
Then what happened to Nara? Hasn't she been able to forget her past? Is Yuki able to take over Nara's heart? Who's that guy?