goddere

One example of the yanderekko is Kotonoha Katsura from the adult visual novel School Days. She becomes Makoto Ito's girlfriend early on in the story, but Makoto is later stolen from her by Sekai Saionji, Makoto's friend who had initially been their matchmaker. One of the bad endings in the game involves Kotonoha murdering Sekai by slicing open her throat with a hand saw in broad daylight, and another has Kotonoha throwing herself from a ledge and dying in front of Makoto and Sekai, traumatizing them forever. In the anime version of School Days, the stealing of Makoto is followed by lots of misfortune that eventually makes her break down. After Sekai kills Makoto, Kotonoha kills Sekai and opens a hole in her body to see if she was pregnant or not (the latter turns out to be true); she then escapes in her family's yacht, carrying Makoto's severed head with her.