Holy hell. That was actually an exciting conclusion. Kai couldn't win, so instead of making the easy choice, he decided to sacrifice himself to save everyone else. I've no idea what will happen to everyone else at this point. There may be a possibility that two of the opponents survived, because their bodies are propped on top of the boxes. I mean, if Terano could survive getting flattened by a metal block and Kirishima could stay alive with a molten blade sliced through his brain, then it's possible others could have survived.
I'm looking forward to the sequel. Thanks for getting us to this point, Guild!