Overall
If you like Musical it would be a great watch and if you like the storyline they maybe give it a try. I went in just from the description and I thought I would love it but the musical part doesnt go too well with me. It is still OkayI have not seen the anime or read the manga btw

Story
The story was good but the beginning felt rushed and the rest felt draggy. I think that the pacing problem had to do with all the songs that kept happening at points that felt random. Like the very first song felt out of nowhere completely. There were other songs that were great transitions and moments of expressing feelings too, so they were not all random. As for the storylines, most felt complete except for the one with the female coworker at the beginning. I thought that was going somewhere. Also, the ending felt like it was being set up for the type of ending that many K-dramas have but then it didn't happen.

Acting/Cast
The acting was pretty good. I liked Kento portraying the ML and as for Takahata Mitsuki its the first time I have seen any of her work, but she was good too. They both seem to have put a lot of effort into their characters and time to learn all the choreographed and songs.

Music
I think that the musical aspect of the film actually hurt it in my personal opinion but I cannot deny that the singing and dancing was beautiful. It is clear and evident that there was so much effort put into it by th cast members.

Rewatch Value
To Me, I have very little rewatch value because I don't like musicals much. However, to other people I am sure that they might want to rewatch as it had great singing and dancing and the storyline was good too.