Story of a Girl Growing Vines on her BodyKarada ni Shokubutsu ga Haeta Onnanoko no Hanashi; 体に植物が生えた女の子の話; Story of a Girl Growing Vines on her Body

A guy likes a girl in his class so he confesses to her, only to find out that she has vines growing on her body. What is this mysterious affliction, and how does it affect their love for each other?