It's more like his power made him see only skeletons, so when he didn't have them and looked on Teruhashi, he understood why people thinks she is so pretty. It was even said on the one of the episodes that he don't like dogs neither cats, because they are just bunch of bones for him. I'm only angry at author that he leave open ending, because we didn't saw who end up with who...
Well... I watched the anime and read the manga...even though sometimes the author tries to shove the teruxsaiki ship down our throats...at the end there is not a confirmed ship. At least not in both the manga and anime, not sure if the author ever said anything about it. Personally I'd much rather Saiki to be alone than to be with teruhashi but anyways saikixcoffeejelly is best ship (づ ̄ ³ ̄)づ
idunno if it's just me or what. but it's kinda pissing me off that i'm admitting to saiki x teruhashi, they had lots of scenes together, even ended up with saiki carrying her publicly unlike the way he usually does (secretly), but then we can't ignore saiki x aiura, he's letting her hug him you know, but WE ALL KNOW WE NEED EITHER EXTRAS OR A MAJOR TIMESKIP SPECIAL
Who does saiki end up with... mikoto or teruhashi?