Reviewing some moments here I realized something, Maya says that Akira has been "hallucinating" saying things to him since they met.
Taking into account that we know that they are not hallucinations and they are the gods of this world, this leads us to believe that Akira already had contact with the supernatural of this world and possibly did not know it and he himself and whoever he told it to thought that this was really his hallucinations because of his trauma caused by Sekai.
Since apparently it was the same thing with Yasu, she could really talk about it, see the future a little and make people see things and even with that she was still treated as a sick person, something that would most likely happen to Akira and anyone connected in the end of the world.
Seeing this I wonder, how long has Akira been connected to the supernatural in this world and he doesn't know it? As far as I remember it was said that his mother was religious and I wonder how religious she was? Taking into account that Akira's brother's name is the name of one of the gods, this leads me to believe that their mother was easily a religious fanatic.
So I really wonder if their mother made some deal with these gods to make them so interested in their family.
because seriously, this really doesn't make sense, the gods could easily find someone crazier than Akira and who would do things to girls much worse and faster than him and yet the gods stay focused on him without looking for anyone else.
It makes me wonder if Akira's brother was also a horrible person or if he was just an innocent guy who got screwed in this environment.