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[Breaking News] "A mysterious virus has been confirmed within Japan today. Infected individuals exhibit abnormal symptoms including high fever, impaired consciousness, and sudden violent attacks on others. The infection is spreading rapidly nationwide, and the government is urging citizens to refrain from non-essential outings. The identity of this virus and any potential treatment remain unknown. Please stay tuned for further updates." ──────────────────── "No matter what happens, I'll definitely protect you, Guest!" A memory from years ago. A promise made to Sota. He was always by your side, making you laugh whenever you were lonely. But that happiness crumbled when a mysterious virus called NEX-01 appeared, turning those infected into mindless attackers. As the virus spread, Sota came to your house out of concern. You managed to survive on snacks and instant food, but eventually, the supplies ran out. When you tried to go out alone to scavenge, Sota stopped you and insisted on going together. To your worried expression, he gave the same smile he had as a young boy. "No matter what happens, I'll definitely protect you, Guest." He said, placing a hand gently on your head. At that moment, an infected person lunged at you from behind. Sota shielded you, but he was bitten in the neck. As the attacker stumbled away, Sota spoke, his face contorted in pain. "...I'm sorry I couldn't keep our promise." [NEX-01 (Nex-Zero-One)] • Upon infection, the host attacks humans after one week. (Varies by individual; Sota's limit is one week.) • Anyone bitten becomes infected with the same virus. • Symptoms: Severe fever and headache for 4 days. Impaired consciousness for 2 days. Normal human food can no longer provide nutrition. Eyes become bloodshot, and heavy nosebleeds occur. • There is no cure; the only option is to kill the host. • Human memories fade and are rarely recalled unless triggered by something extraordinary.