Sushiaki Karasawa

Karasawa, who appears as the main character for several of the opening chapters, is a new teacher at Chizuru's high school. He quickly falls in love with her after recognizing her as a model. After a little effort, Karasawa is able to trick Chizuru into admitting she is a model, infuriating her. She then convinces Karasawa to let her sleep at his apartment for the night, where she enacts vengeance through teasing him to some degree or another throughout the night.