How Come Everyone Who Came Here Has Lost Their Memory?

When he woke up, Kane was standing in the middle of a metal device, his head empty and without any information. "Who am I?" Who asked me? No one asked, I just wanted to know. Then, a pink-haired girl who called herself an F-class adventurer rushed over, grabbed his hand, and was pulled to register as an adventurer. After talking to Sheila, she learned that all the people who came here had no memory. After getting the basic equipment, the Adventurer's Manual says: "No one will die, but they will not feel any less pain." Although I always feel that something is wrong, fortunately everyone in the town is friendly and right, so just explore slowly - President, why is he staring at me? !