We are now going on half a century of lazy Japanese author's using the high school setting as a crutch in manga.
There is done to death, and then there is something like this that has transcended to the afterlife.
Spirit looks like a totally different girl due to the uniform, hair, etc. But translation makes it sound like it is just the girlfriend's spirit. Hope they dive into this more!
I adore how Professor has turned into a loving man.
Yamada Kanehito is straight up killing it with Sousou no Frieren, so to see a more comedic but somehow equally tragic tale from them is such a treat.