At first i wasn't really expecting anything in the manga. The one shot was indeed good but since its the manga we're talking about i was prepared for the long run.
The story for me was pretty normal pretty similar to some anime/manga that i have seen
and thought to myself that it will be another "Generic romance manga that stalls and had really slow development on both the ML and FL side" . But boy was i wrong. It has some slow pacing here and there, but the absolutely incredible story telling makes it worth it. As for the art i think its safe to say that its pretty average nothing much to say about it.
For the characters though they are all excellent. As someone who has read a lot of romance making side characters shine and have their own problems and background stories are pretty much what makes a good manga is.
Overall i think this one is a must read if you're looking for a really mildly serious romance to immerse yourself on.