You can read our previous reviews of Drifting Classroom vol. 1, Vols. 2 & 3, and Vols. 4-6.
The kids continue to slog through their unfolding disaster, and now some gaps are starting to show in the manga-ka's apocalyptic future. The biology does not really work. Some scenes are blatant info-dumps that don't make a lot of sense in the context offered. The abilities of sixth graders are pushed to their believable limits. And the third descent into Lord of the Flies mode is not quite as interesting as the first two.
Still, there are a few character moments and interesting context in this mid-70s look at a post-apocalyptic world. In a time when Americans were worrying about nuclear war, at least one manga-ka saw climate change as a global threat.
The Drifting Classroom vol. 7, vol. 8 and vol. 9 are all available from Right Stuf, Intl., an online retailer specializing in anime and manga.