This is a review of the entire series!
For Sho Takamatsu, it seemed to be an ordinary day of school like any other. In the aftermath of a sudden earthquake, his entire elementary school vanishes into thin air along with all the students and teachers that were trapped inside. The earthquake seemed to be so powerful that it caused a ripple in time, projecting the school into a dark and bleak wasteland where nothing but death, mutants and mind-breaking anomalies await. Sho takes on the role of the leader, trying to keep the other children safe from harm while searching for a way back home.
The Drifting Classroom takes things at a very slow pace. The horror elements don't even begin to seep in until several volumes into the series. While it starts off slow and does drag a bit in places, I think every volume is better than the previous. It took me a while to get into it but I really started to feel invested once I saw the bigger picture of what it was trying to portray.
While the dialogue and reactions of the characters seems a bit clunky and unrealistic at times, it's important to remember that many of the characters are extremely young elementary school students. Most of them haven't even learned how to talk properly let alone think themselves out of life or death situations. Watching children so young and vulnerable get thrown into one nightmare after the other led to some very intense chapters that didn't shy away from showing little kids being brutally murdered, eaten and smashed to pieces. It might not start out scary, but each volume escalates the horror, the violence and the stakes. As hundreds of children are driven mad with fear, hunger and isolation with no adults to care for them, it's only a matter of time until they begin to turn on each other as well. These kids can give the children in Lord of the Flies a run for their money once their minds start to break.
Some smaller things such as the art quality and the sometimes stagnant way the characters and their reactions are drawn feel off-putting and even a bit silly at times, but it's important to remember that this is one of the pioneers of horror manga, written all the way back in 1971. Devilman is another great manga that has some of the same issues. They're both great series, but you can tell they were written during the experimental phase of manga when they were just beginning to find their way into mainstream entertainment. Though certain aspects of The Drifting Classroom haven't aged that well, it was surprisingly ahead of its time in other ways. As the story progresses, it begins to tackle the themes of overindulgent consumerism, industrial pollution, and the greed of one generation causing major issues for the next generation. It goes into dark detail about how every little action we take that harms the planet hurts future generations of children far more than it hurts any of us.