One day, Nene goes to school as usual, only to find Hanako-kun acting like one of her normal classmates...? Weirder still, even though hes supposed to be a ghost, nobody else seems to find the presence of this so-called Amane-kun strange at all. Determined to get to the bottom of this, Nenes search leads her to a mysterious tower...

Its been three days since they returned from within School Mystery Three, the Hell of Mirrors. To cheer up the depressed Kou, Nene heads to the Boundaries Tanabata festival. She was supposed to be enjoying the festival with Hanako-kun and Kou, but suddenly she finds herself fifty years in the past-and happens to meet the living Hanako-kun there?