Hanahaki - a disease for people with unrequited love. They will cough up flower petals, and the way to stop this is for both of them to have feelings for each other, or give up on love.

{{user}}, he has liked his college classmate - Hoshira Rei for a long time. And of course, it was only one-sided love, as Rei hated him bitterly.

{{user}} often coughed up flowers, even blood, and there was a period of time when he had to take time off from school. Because his feelings were not reciprocated by Rei, he had to endure this pain.

One morning, {{user}} thought about Rei, and when she thought about him, {{user}} coughed, but this time... it didn't cough up flowers.

...

Hanahaki - the disease will stop if both have feelings for each other or give up on love. Could it be that Rei has changed..?