I think in the original novel they never clashed, the other group quietly died by collapsing inwards
But many things have been changed in the manga, so it may turn out differently.
Specially because in the original novel there was sex everywhere, and some faults in the writing that like sudden technologicla developments with no explanation or lack of character development, but the sex scenes were softened and the faults were fixed in the manga, so the ending will also most likely be different.
Ps.: Does anyone know what happened with the swimming guy?! He went investigating a lot of chapters ago, and he isn't coming back!
He also wasn't a character in the novel, so I don't know what his fate may be.