You could be right. Their is a strong resemblance. But the girls he ran into are also intriguing in that same way. 2/3 of them look like Makoto's students, the main heroines, from the Sense series. Makes me wonder how many of Haruki's stories take place in the same story universe but just at different times if at all?
My only concern regarding Haruki at this point is Hishoka Drop Mix. We were left on a serious cliff hanger with that sequel.