Chapter 191 - Chapter 193

Yasu nodded. "He has what is called Dissociative Amnesia. It is a condition in which a person cannot remember important information about their life. It may be limited to specific areas or part of the person's life history or even identity. Most patients forget memories that cause them pain or stress or they forget memories that could endanger their lives. For Aito, you and Aera caused him the most pain and memories about you two made him mentally unstable so his brain blocked them out, enabling him to live a normal happy life. This change can either be temporary or permanent. In Aito's case, I think it could be permanent because it's been five years but he hasn't remembered a thing"