"I knew who that person was at a glance."

One day, on her way to work, Sayuri Terazono, suddenly spots an all too familiar back in the crowd of people before her. Though many years had passed since she last saw Lisa, there's no way Sayuri would be able to forget her precious Kohai. After all, Lisa wasn't just any Kohai for Sayuri, she was special.

But, there's no way Lisa would remember her after all this time, right?

Or does she...