The two grew up together as childhood sweethearts, and they took care of each other as adults. They originally planned to get married as soon as they graduated, but it was a pity that fate played a trick on them.
On the day when the male protagonist turned 21, he suffered from gastric cancer. When he went for a check-up, it was found to be in the late stage. He did not tell the female protagonist. When she found out, the male protagonist could only look at him weakly. After he left, his world was dark, but slowly a ray of light came in...
Intention: On a whim