I'm a very big fan of the manga, it lead me to watch the movie too.

Story: I was a bit disappointed because the movie showed only like 50% of the story. Could be understandable because the manga consists of 14 volumes and the movie is only less than 2 hours long, but a lot of the story's charme was just swept under the table. An easy fix would've been a part 2 for the movie. Maybe that'll even happen, tho I'm not that sure it will. Otherwise, that 50% was portrayed well enough to keep me watching, it just didn't feel complete.

Acting/Cast: The acting was pure perfection. Well, it's a story about theater, what else should you expect? The character's expressions were on point, it felt genuine.

Music: The music was nothing special I would remember after watching, but it blent very well with the story.

Rewatch value: As I love rereading the manga, I'd probably rewatch this movie too as a little add on. But as a stand alone movie? I'm not sure.

Overall: I only suggest watching the movie if you already read the manga, otherwise it was pretty well done, just lacking a huge part of the original storyline.