...no? There's no indicator she's imaginary or false, just that the protagonist keeps a picture of her girlfriend as a wallpaper to motivate her when things get tough.
I will try to live as best I can, as long as she wants me to.Even if the rest of the world doesn't need me,Of course I will, senpai...I want you to be by side forever...I appreciate that.after our high school graduation.You agreed to move in with me,You're real nice too, Sakura.