I think Sakamoto was playing as Naoto since the mom was mental so he was playing as her son. Why? When the mc called the mom, Naoto/Sakamoto told the mc to never call the mom like a warning. Their voices were different since he was trying to make himself sound younger To probably fit what the real son’s age was. But that’s why the mc was able to hear Sakamoto voice from time to time when talking to Naoto on the phone. Since the mom was mental she wouldn’t be able to recognize her son.
I think Sakamoto was playing as Naoto since the mom was mental so he was playing as her son. Why? When the mc called the mom, Naoto/Sakamoto told the mc to never call the mom like a warning. Their voices were different since he was trying to make himself sound younger To probably fit what the real son’s age was. But that’s why the mc was able to hear Sakamoto voice from time to time when talking to Naoto on the phone. Since the mom was mental she wouldn’t be able to recognize her son.