The player controls Ayano Aishi (nicknamed Yandere-chan), an apathetic Japanese high school girl who has developed a crush on Taro Yamada, a fellow student often referred to as "Senpai". Over the course of ten weeks, a different girl will fall in love with Taro, becoming a target for Ayano to eliminate. The player has the ability to kidnap, torture, poison, electrocute, matchmake, befriend, betray, and drown rivals, befriend other schoolgirls, play small mini games, access a street where the player can earn money by playing a maid cafe minigame, spend money at shops to buy different types of items, and more.

From what im aware from ages ago, its more on the psycho aspect of the term. How i imagine it, manhunt, but anime.