A month has passed since Toshio Matsumoto was diagnosed with cancer. In the darkness, all he can think about is Tomoko Itoi, his former classmate. He fell in love with her because she treated him without prejudice, even though he was a lowly man. Forty years have passed since then... Toshio is now lost in thought alone. He is 53 years old, with stage 4 pancreatic cancer. In his imagination, he has tainted Tomoko's smiling face that he remembers. He couldn't help it. And then...