The closest other manga nitta has done is * embracing love *
Iwaki and kato have been togerher for almost 8 years ..( story timeline ) ..wants to see them age together .
And she almost had it down pat with the * my voice * series
With the two seiyuu that have bern together friendship wise only to realize their love in the end ..and I ain't talking the young ones either lololol
Not sure I agree on the ghost thing, I saw it as their memories. Two old men who love each other dancing together for maybe the last time & in their minds it's like that first time again when they were young
The last chapter shows the ghost of one coming to take the other home .
You can tell by how the hands changed from thin and arthritic to young and youthful ..
Their together forever now is what sensei has stated through her art ...and I NEED tissue ...
Wish there was more like this ..!!