Thread:IRosefeather/@comment-5299258-20140419172827/@comment-5986522-20140419174122

Ayano had the Favoring Eyes ability (as revealed in Kagerou Daze III -the children reason-) and passed it down to Shintaro at some point of the story (I don't know where exactly it was mentioned, but I think in one of the novels?), so that would logically mean he has the Favoring Eyes ability now. I don't know why it is stated as unknown on these sources, considering that factor.

The wikipedia article on KagePro states the same, ( ....Ayano grew increasingly concerned of the safety of her brothers and sister. She committed suicide and jumped off the roof of her school in an attempt to gain red eyes and an eye ability for herself in order to try and save her family, but despite succeeding in obtaining the "Favouring Eyes" ability, which she can use to see the world outside of the Heat Haze. For that ability to work, Ayano would have to have someone outside of the Heat Haze to "see" with her eye ability. She is unable to escape the Heat Haze as she did not die in a pair. The Ayano that Black Shintarō meets is in truth Kano, who does so to spite Shintarō, whom he believes caused Ayano's death. In Route 1, after Red Shintarō meets her in the Heat Haze, she passes her eye ability to him and dies permanently... ), so I assume it is more than just a theory.

As I don't own the novels, I can unfortunately not tell if they were the source of it, sorry.