Board Thread:General Discussion/@comment-27180432-20160126020431/@comment-24908808-20160204070724

It is because Kokona is a test rival. Most of the murder mechanics can only be used on her, unless a players want to go through the trouble of modifying the game. I'm sorry that your all-so precious waifu is getting slaughtered, but really it's for the future of the game.

Why Kokona, of all girls though, it's probably a random selection. You only have YandereDev to blame.