Oku's "Killing City Gaiden E" Ancient Chapter (Episode 07-08) Despair

Summary: At the end of the timer, the [GANTZ] device suddenly activated, teleporting the half-guards and the others to a mysterious river battlefield. Surrounded by swaying trees and babbling rivers, they are in a tranquillity that hides unpredictable dangers. Suddenly, the cries of crows rang out in the sky, and a large flock of crows flew towards them like shadows. However, this is no ordinary crow, but a well-armored crow soldier with deadly power hidden in their wings......

[Oku Haoya "Killing City Fanwai E" Ancient Chapter (Chapter 07-08) Despair!]:

After a fierce battle with the Raven Soldiers, the crowd ushered in a brief moment of silence exhausted and victorious. The smell of gunsmoke wafted through the trees, and the corpses of crows echoed across the river, a battlefield of victory and exhaustion. However, just as they were resting for a while, the sky suddenly became unusually overcast. The clouds were thick and the stars were dim in the night. Everyone looked up vigilantly, and an ominous atmosphere permeated.

A huge shaking sensation shook everyone, as if the earth itself was trembling. A deafening roar followed, like a roar from the depths of hell. The appearance of this monster made everyone feel an invisible pressure, as if the whole world was standing still at this moment. A terrifying aura swept over them, and the crowd realized that this was perhaps the most formidable foe they had ever faced......