Sanae Nagatsuki

Sanae Nagatsuki is Eiko Aizawa's childhood friend and classmate and is intensely infatuated with Ika Musume. She constantly photographs Ika, imagines winning her affection, and becomes jealous when other girls spend time with her.

Ika does not return Sanae's feelings, but Sanae can still remain calm and helpful around her when Eiko calls on her for something serious. She owns a dog named Alex and keeps a large collection of cosplay outfits.