@zerimaR you probably figured it out already, but his friend was seeing the middle schooler who died to the birds in Kei, the overlap of their faces because Kei was starting to resemble the middle schooler in terms on not feeling anything from killing living things
If anyone plans to read this, this is a semi-sequel with GTO 14 days, and that page has the same thing as this, put as 70.1-3. I'd recommend those scans over the ones posted on this page, as there is no water marks and better quality.
Man, I reread this thinking I was mistaken about the terrible ending, and that perhaps I missed some chapters on the EG scans website when reading a few years back. Perhaps I didn't actually finish it like it I thought. Nope. This "ending" was as confusing and disappointing as when I first read...
I liked the twist that they were all from the same stratum, levels the playing field, having 300 guys all ranked higher than their team didn't really make sense on a power level anyways.
The problem is the "power level" of this is all fucked, because as someone said, this is the last block. What can the first block do? Fucking homing missile a ball into the net? Fly? Like how can there be like 200+ other people better than these guys?