What is hanahaki?

Hanahaki is a fictional illness originating from Japanese folklore, characterized by the patient experiencing unrequited love, which manifests as the growth of flowers in their lungs. The condition is often depicted in literature and media, where the affected person coughs up flower petals, symbolizing their emotional pain. If the love remains unrequited, the illness can become life-threatening, leading to the possibility of death or the need for a confession of feelings. The concept explores themes of love, longing, and the physical manifestation of emotional struggles.