Age: 22+ Height: 170 cm Class: 2-B A born sadist, Nikaidou is Keima's homeroom and Japanese teacher. She has been ignoring Keima ever since he told her that there are 5012 games that are more fun than her lessons. Nikaidou is also a school senior of Jun Nagase. Major spoiler (Source: AkaksukiUlquiora, Wikipedia)