Thinking about this manga, I've realised a lot of stuff. How it ended with an explosion is similar to how the movie ended that's obvious, but the reactions are similar too. Surely most of us would've laughed at that unexpected ending just like the students in the manga did for the movie. We wept when we were going through eri's videos, just like the students did and just like how she wanted. It's a lot more meta when you think about it that way. But i won't say it's a particularly 'good' manga, just very experimental and a release of ideas from the mangaka which he is allowed to do! Still makes for an impactful manga (or rather movie) and very creative nonetheless.
Goodbye Eri