Zero Echo

People on the verge of despair have a strange way of survival. In this mysterious six-level death hell, the protagonist who has lost his memory is named No. 007. He was originally supposed to die but survived in the hospital. He never thought about living. In order to understand the answer to his happiness, he embarked on the road of exploration, but the road was difficult. A terrifying and suffocating dark environment surrounded him. He was determined to desperately open the door to the mystery again and again...