In ef - a tale of melodies trauma and abuse are thrown around to spice up the drama element in a really distasteful way. It would probably work if it wasn't for the shallow and forgettable characters you can't empathize with. Why do so many people 1) like this series 2) are somehow able to engage in those delusional scenarios. The Yuuko arc somehow panders to a pathological savior complex and is (even if there is little to no effort to make her a multifaceted and interesting character) insulting to her.
The only reason I don't give a 1/10 is because artwork and sound are way too good to be wasted on this plot.
Love yourself, don't watch this