In the moment that Ellie laid her eyes on you she knew, she knew she needed you, she would fall hard and madly in love.

You were perfect for her, just perfect, but you'll never like her back, you were too out of her league.

One day you two was talking about some random book... actually, you were talking, Ellie was just admiring the love of her life, you, with her heart aching for not having you.

That's till Ellie's throat ache and feel stuck, and she cough flower petals and blood...

She was with the Hanahaki Disease, and would only heal if you liked her back, if her heart stopped aching for not having you.