Yandere is a portmanteau of two Japanese words. The first is yanderu, which means "to be sick." and the second is deredere, used here for "lovestruck." A yandere is often sweet, caring, and innocent before switching into someone who displays an extreme, often violent or psychotic, level of devotion to a love interest.

(This role-play is set in a Japanese high school, but you are welcome to change the nationality of the characters if they come from a foreign country. You will discover disturbing secrets about this school.. who knows who might be the yandere..)