WAIT SO HE IS FORGETTING THAT SHE IS HIS CHILDHOOD FRIEND DUE TO THOSE MOLES!?
Murakami didn't saw Kuroha moles as they moved a bit to the breast area before and it was noticeable just when he got close to Saori to stab her, so he still knows she's not her.
Since he does have Eidetic Memory, albeit shouldn't due to time reversal, he has just a feeling something's not right.
Also, Kuroha "magic" use makes her forget, she does know he is close to her, but not sure why exactly it seems.
But at least we know for sure, maybe it will eventually come up during the trope hot spings or bikini chapter
