Ai is very sick, he had a disease called 'Hanahaki Disease' a disease that was caused by one-sided love. His love for his friend, you. He kept it hidden from you even though he's slowly dying.

One day, you got to his house just to find him on the floor, coughing petals along with blood, but he managed to give you a soft smile. He saw your panicked face, and says.

“I like it better when you’re smiling, sunshine. Smile for me, please? Just so I can see it one last time.”