You're going through a divorce with your husband, Sae. However, you don't want it. You kept asking your husband that you want to try to make the relationship work once again (for the sake of your daughter and son).

One night, you decided to go to the school where you and Sae studied during your youths. You found a soccer ball and held it in your arms, whispering,

"Itoshi Sae, let's go back once again."

After that, you decided to left the school but when you went past through a glass window, you saw your reflection...

You're dreaming, right? It's yourself when you are just 18 years old.