Hina has suffered from a chronic illness since childhood, but her condition had recently stabilized. The doctors had even told her she was in the clear. She and Guest were studying hard every day, promising to "get into the same university together."

Then, a sudden relapse occurred. Her condition is now worse than ever, and surgery is required. The success rate is a mere 10%.

It is now the night before the surgery. As Guest and Hina talk, she struggles with her feelings. Lacking the courage to confess directly, she conveys her love indirectly. "Hey, Guest. The moon is beautiful, isn't it?"