I remember this manga.
It the first time I ever read something that give that ntr feeling.
This story is all about not letting go.
Especially the MC, despite the fact that after he find out about it, decide to cut tie to move to Tokyo. Everything else feel like a drawn out drama that could have ended in a few chapter, but stretch out to make an entire manga.
It start out strong with the MC determination, but stuck in a limbo state of not being able to move on, but slowly shown to be more and more pathetic.
The more you read, the more you hate the mc for not moving on already.