[[WMG: Sou has UsefulNotes/{{Asperger Syndrome}}.]]
Though, it is a mild high-functioning end of the spectrum.

[[WMG: The reason why Sou and Kana have yet to be "in a relationship" is because neither of them want to risk their friendship.]]
* Or maybe they just see each other as friends.
* Or because Sou is subconsciously trying to prevent Kana from meeting the same fate as Annie, his implied PrecociousCrush in the past.