Three years ago, Mayumi-sensei left the classroom due to her pregnancy. Since that day, a huge hole has been left in my heart. No matter what I did, she was always in the back of my mind, and I spent my days in agony, clutching the birthday present I never got to give her. Then, that day suddenly arrived. In a cafe I happened to pass by, I saw the figure of the teacher I could never forget... I quietly approached Mayumi-sensei, who was looking down with a lonely expression...