The plot was okay overall, but the characters were quite...undeveloped. Like how everyone stayed the same in the end-the once untouchable genius opens up to his friends, the main character (aka the hero) saves everyone by his righteousness, his childhood friend who's head over heels with him, and the school delinquent who turns out to be a kind person. Everyone is the same throughout the whole story-and considering that this has 185 chapters (to the dot), the only thing that really changed was the plot. Or more like, what happens.
As one review said, the technology doesn't add up. Not only that, the timing, and the bodies, too. At Memorial M, why are the traps all around? And if it's a grave, why are there 2 Chimeras? Graves are usually made, and preserved, with a certain degree of respect. Having 2 Chimeras at the bottom of the grave...ain't the best way to show respect. The bodies in the School, too. Why would there be a virus which attacks people (and a robot, too) lurking in a container, having already killed off goodness knows how many people? In the end, the use of the School wasn't explained. In fact, it only served to show that they were in the future. And why does the School prevent the animals from entering? Shouldn't that be used on the other places, too? And what's with all the bodies everywhere? There was no indication as to what killed them, or at least none that I could tell. Also, what do they mean the Sensei could probably figure it out? He wasn't dead, was he? O.o And...if they were already dead...why could they die again...though sometimes, they deserved it.
But it was also good, in a sense. (Excluding all the eechi parts. Sometimes, it was overdone, even for eechi. But that's what I think.) How there was different 'tribes', and the different weird titbits of knowledge added in (like the smallest country in the world, or how those at the Research Center (or Pyramid) were being controlled by the Whistle Blowing and all) was quite interesting.
Overall, it was average. Kinda...stereotypical though. Pushed this manga away for ages, thought it was another boring survival manga. The distopia of it all, and the extinct animals in the future-kami.
And I just realized...the students might not have made it back, according to a time chart. The mom died approx. 40 years after the students died right? According to them, the spent 3 years (right after they realized they were in the future or somesort) and a few months before that (let's say 1 year max). So in total, 4 years on the island. So why did the mom not see her son again? Just wondering, not sure if it's true...