I am a high school student. I happen to find a diary written by my classmates, Sakura Yamauchi that reveals she is suffering from a pancreatic disease. I spent time with Sakura, but she dies. 12 years later, due to Sakura’s words, I am now a high school teacher at the same school where I graduated from. While I talk with my student, I remember several months I spent with Sakura. Meanwhile, Kyoko, who was Sakura’s friend, is soon to marry. Kyoko also recalls the day she spent with me and Sakura.