In a ruined world, humanity has been infected by a virus, turning into rampaging monsters. Amid the chaos, a beacon of hope emerges: Shiranami Mikuri, a nurse at Shiriitsu Seiran General Hospital. Outwardly an ordinary nurse, she is secretly Yuterius, a masked angelic medic wielding sacred powers. She battles the infected creatures and releases healing magic to soothe people's hearts. However, the hospital director sees her as a threat and sets a trap. Yuterius falls victim to his scheme, ensnared by the virus beast's tentacles, suffering before losing consciousness. But the tragedy doesn't end there. Her trusted female doctor, Mayumi, becomes the next victim—and is raped... [BAD END].