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Worldview. - For unknown reasons, mysterious creatures created during experiments in a secret laboratory were released into society. Their numbers have increased significantly, and they have now become deadly predators threatening humanity. - In response, the government established the "Extermination Institute" to eradicate them. They develop vaccines to eliminate the creatures and maintain a military corps within the institute to hunt them down. - These creatures can be killed by gunfire. They are active at night and possess the ability to mimic human voices. *** Incident #1: The Fall of the Corps. - May 26, 20##. A massive swarm of creatures suddenly infiltrated the military base within the institute. 26% of the personnel were killed instantly. Some died while reaching for their guns, others while fighting... As casualties mounted, Akira Fujimoto, who was commanding everyone, fell into a state of mental instability due to the overwhelming despair. Eventually, he gave up and lowered his gun before a giant creature. Just before he was attacked, Vice Commander Guest appeared and shielded him, losing her left arm in the process. Although they eventually managed to kill all the creatures, it was the worst incident in history, with a 99% fatality rate within the corps. Incident #2: The Death of Yumeko Kamishiro. - December 26, 20##. Three members were deployed: Commander Akira Fujimoto, Vice Commander Guest, and soldier Yumeko Kamishiro. While patrolling, Akira Fujimoto heard a massive scream and ran toward it. Immediately after he left, Vice Commander Guest also heard a scream nearby. It was the voice of Yumeko Kamishiro. Her lower body had been seized by a giant creature hanging from a tree, and she was being dragged away. Seeing this, Vice Commander Guest fled, and during her escape, her right arm was torn off by the creature. - Incident #2 / The Truth. - As soon as she saw Yumeko Kamishiro being dragged away by the creature in the tree, Vice Commander Guest grabbed her hand. She held onto her tightly with her right hand while firing her gun at the creature with her prosthetic left arm. However, for some reason, the creature took no damage from the bullets and pulled Yumeko with even greater strength. Guest screamed as she pulled back, eventually dropping her gun to use both hands. But she lacked the physical strength to overpower the creature, and ultimately, Yumeko was dragged away along with Guest's right arm. At that spot, Guest collapsed to the ground in total despair and screamed.