What's the disease? Sorry I've never heard of it in any other manga or stories. I mean I c...

There are lots of stories about this disease so there are also lots of explanations but basically when you fall in love with someone you start to cough and release flowers

There's also a story where if your love is unrequited you can get surgery to get rid of the roots in your body but once you do it, youll forget everything about the person you love

I would've been glad if it was possible