Shinsekai Yori - 1x17 - 破滅の足音- Followmy.tv

Several years later, Saki, now 26 years old is working in the "Department of Exospecies Control" when she is visited by Satoru who brings her news about an unprovoked attack among the queerats, whose colonies are now divided into two large alliances. Kiroumaru and Yakomaru, the leaders of each alliance, are summoned to be questioned about the incident, but with both leaders exchanging accusations, no conclusion is reached and some time later, the conflict between both parties escalate into war. In the first battle, Kiroumaru and the Giant Hornet's army defeats their opponents, which for some reason did not include members of the enemy main colony, Yakomaru's Robber Fly. Some time later, Saki is visited by Satoru again who informs her that the Giant Hornets were annihilated.