Niko Kanzaki  

Niko-chan

A girl with limited financial resources resides with her sibling, Atchan Kanzaki. In order to acquire funds, her brother applies for employment at St Lunatic High School. To his surprise, not only does he secure the job position, but also permits Niko to enroll in the nighttime classes. However, it is unfortunate that these particular courses are intended for demons.