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.

Crush had been acting weird lately. Like weirder than weird. They been acting all kind and lovingly to oc but when it went to other people. That was a complete different story, when oc wasn't paying attention crush would threatened the people to stay away from you. So soon oc started to loose a couple of friends throughout the entire thing.

    Oc thought they did something wrong but crush was always there telling oc that it wasn't their fault. After a month of that happening Oc was out taking a walk (or going out to train) until seeing crush. Oc goes to greet them but soon realizes that crush had roses where they were. There laid the dead body of (person of choice), oc eyes widened and held back tears and a scream. Though it wasn't enough to stop crush from seeing you when they had felt your presence.

(What do you do next?)