Synopsis
Haruki Shiga happens to find a diary in a hospital one day. The diary belongs to his classmate, a girl named Sakura Yamauchi, who is revealed to be suffering from a terminal illness in her pancreas, and only has a few months left to live. Sakura explains that Haruki is the only person apart from her family that knows about her condition. Haruki promises to keep Sakura's secret. Despite their completely opposite personalities, Haruki decides to be together with Sakura during her last few months.