In the same bright of day Nao and Akane were at home, not knowing anything about the perpetrator, or that she was going to receive a call from her. Then at that moment Nao's phone beside her on the arm of the chair started to buzz. She picked it up and answered...  

"Hello again, Furuhata-San..."

 "Eh?" Nao seemed surprised at the sudden greeting.

"You think you know who this is, then your wrong." The Mysterious Caller Replies.

  Her face seemed slightly confused, turning to Akane for advice. She shook her head, and is as clueless as Nao herself was.  Then Nao started to remember...

During the same timeframe as she was sat on her chair with Akane by her side, Nao got flashbacks, as she was in deep thought The Mysterious Caller started yelling "Hello! Are you still there Furuhata-San?!" Then at that moment Nao hung up the phone.