Chapter 349-350 Spoilers/Discussion/Prediction
349 Insufficient Struggle
It's shown in the giant screen through a video of what it seems to be another battle with the bone monsters that happened before Kurono and the others came. 2 guys with the "Hard Suit" (that's how they call the gorilla suit) attack one of the bone aliens and it seems like the monster evades it, then the monsters trash both of them. Kurono and company try to use all their weapons to attack but all seems useless but then Kaiji finds the "weak point" of the bone aliens that is located in the back of their necks and then attacks it with his sword.