When all volley team had grown up and had kids. They wanted them to see how the past was when they were young. During a fun game, Kurinaha hit the ball but something happened. The kids went in the past but don't know how to get back home. Will they ever go back home to stay with their past parent?
I love the story, how the kids go back in the past. It was cute and the first book I read about the haikyuu character's future kids. I love the book.