The members of the ESP Research Club set out to find Haruka. They arrived to a small town, and there they ran into a shrine priest, who actually knew Haruka. He took the members of the club to Haruka's grandfather's (who is a pervert too) large house. Haruka still felt guilty for all that had happened to Yoshihisa and her classmates, refusing to return. Haruka finally changed her mind when Hiyori arrived to apologize to her.
Episode 4 of Kotoura-san was "interesting". Haruka was expectedly found and convinced to return, but two things stood out from this episode. The pervert moments with Haruka's grandfather were creepy. It does not kill the series but seems of bad taste (or maybe I am being a hypocrite). The other thing that stood out to me is that Hiyori has finally come around in regards to Haruka. I give this good, but kind of uncomfortable, episode a 8 out of 10.