[FREE SPOILER REVIEW]
Uchiage Hanabi is a manga adaptation of the film with the same name, that's based in the 1993's drama.
The story of this manga is the same o the anime, with minors differences, but in my opinion, the final of the manga is better explained than the anime, but yes, there an open end, if you dislike anime/manga that has open end, don't read this manga nor anime, you'll dislike it!
And in my anime review I write that the story was a little bit confuse, but in the manga isn't confuse, I understand it very better, it's a good thing.
The art of this manga
is pretty cool; it's very similar to the anime.
To finalize it, I'll tell you something, if you disliked the anime film, you'd (probably) not like manga, because as I said, it's very similar with anime.