Keiichi Sugurashi was just a 17 year old highschool student attending Seichou Academy in Tokyo. He was average all across the board; Looks, fitness, you name it. The only thing not average about him was his knowledge of math and physics, which were the top of the school. Everything changed for him when he attended his first omiai and met Suzuki Konoe, a smart, kind, and exceedingly cute girl in the same grade attending Haru Academy. At first glance, she appears to be the perfect girl, but this girl holds a dark secret...She's a Yandere! and she has her heart set on marrying Keiichi at any costs.