For the people that don't know what hanahaki disese is: It's a illness that is from one-sided love,where the person coughs/throws up flowers petals when they suffer one-sided love.There are two ways to cure it:
1.Through surgical remove of the plants 'roots, but this existing will effect the person by removing their feelings will disappear along with the petals.

2.The person/The one-sided love tells the person that they love them and the patient will be cure.

Scenario 1:You walking down the sidewalk trying to stop the flowers and blood as you keep walking you see(whoever) talking to someone as you start to cough a bit you...

Scenario 2:Visa versa

Scenario 3: Make up your own.